A few hundred additional described species
Abacaelostus filicornis
Abacetini
Abacetus
Abacillius
Abacillodes
Abacionidae
Abacoleoptus
Abacomorphus
Abacops rugipennis
Abaeis(incertae sedis)
A-nicippe
A-nicippiformis
Abananote
A-abana
A-erinome
A-euryleuca
A-hylonome
A-radiata
Abantiades
A-albofasciatus
A-aphenges
A-aurilegulus
A-barcas
A-fulvomarginatus
A-hyalinatus
A-hydrographus
A-labyrinthicus
A-latipennis
A-leucochiton
A-magnificus
A-marcidus
A-ocellatus
A-sericatuas
Abantis
A-bamptoni
A-bicolor
A-bismarcki
A-contigua
A-efulensis
A-elegantula
A-eltringhami
A-ja
A-leucogaster
A-lucretia
A-maesseni
A-meneliki
A-meru
A-nigeriana
A-paradisea
A-pseudonigeriana
A-rubra
A-tettensis
A-venosa
A-vidua
A-zambesiaca
Abaptilon(EXTINCT) (incertae sedis)
Abaridius
Abariform clade
Abaris
Abaris aenea
Abaris aequinoctialis
Abaris aquilonaria
Abaris basistriata
Abaris bicolor
Abaris bigenera
Abaris convexa
Abaris erwini
Abaris franiai
Abaris impunctata
Abaris inaequaloides
Abaris inflata
Abaris metallica
Abaris mina
Abaris napoensis
Abaris nigra
Abaris nitida
Abaris nobilis
Abaris notiophiloides
Abaris opaca
Abaris picipes
Abaris retiaria
Abaris robustual
A-sensu stricto
Abaris splendidula
Abaris tachypoides
Abaris wardi
Abascantodes
Abax
Abditomys
Abdiunguis
AbdopusNorman and Finn, 2001
Abelia
Abeliophyllum distichum
Abemus
Aberis striolata
Aberranta
Abies
Abiotrophia
Abisara
A-abnormis
A-aita
A-bifasciata
A-burnii
A-caerulea
A-chela
A-delicata
A-dewitzi
A-echerius
A-freda
A-fylla
A-fylloides
A-gerontes
A-geza
A-intermedia
A-kausambi
A-neavei
A-neophron
A-rogersi
A-rutherfordii
A-saturata
A-savitri
A-simulacris
A-talantus
A-tantalus
A-zanzibarica
Ablepton
Aboeurhexius
Abothrus
Abraeinae(including Trypanaeinae)
Abraeini(non-monophyletic)
Abraeomorphus
AbraliaGray 1849
A-andamanica
A-armata
A-astrolineata
A-astrosticta
A-dubia
A-fasciolata
A-grimpei
A-heminuchalis
A-marisarabica
A-multihamata
A-redfieldi
A-renschi
A-robsoni
A-siedleckyi
A-similis
A-spaercki
A-steindachneri
A-trigonura
A-veranyi
AbraliopsisJoubin 1896
A-affinis
A-atlantica
A-chuni
A-falco
A-felis
A-gilchristi
A-hoylei
A-lineata
A-morisii
A-pacificus
A-tui
Abrawayaomys(incertae sedis)
Abraximorpha
A-davidii
A-esta
A-heringi
A-pieridoides
Abrochtha
Abrophaena
Abropus carnifex
Abrota ganga
Abroteles
Abrotelina
Abrothicine group
Abrothrix
Abscondus(EXTINCT)
Aburria aburri(Wattled Guan)
Acada
A-annulifer
A-biseriata
Acalophaena
Acalyptomerinae
Acalyptomerus
Acalyptratae
Acalyptris
Acamaldes
Acamatusinella
Acanaloniidae
Acanothpale decempedalisC. B. Clarke
Acanthaceae(acanthus family)
Acanthacorydalis
Acanthanops
Acantharea(a type of radiolaria)
Acanthastilbus
Acantheae
Acanthicomus
Acanthinevania
Acanthisittidae(New Zealand wrens)
Acanthixalus
Acanthizidae(scrubwrens and thornbills)
Acanthobrahmaea europaea
Acanthobunocephalus
Acanthocalyx
Acanthocephala
Acanthochitonina
Acanthocliarthrus
Acanthocnemidae
Acanthoctenidae
Acanthodii(EXTINCT)
Acanthoecidae
Acanthoferonia
Acanthogilia gloriosa
Acanthoglossa
A-(Acanthoglossa)
A-(Cyclodesia)
Acanthognathus
A-brevicornis
A-lentus
A-ocellatus
A-poinari
A-rudis
A-stipulosus
A-teledectus
Acantholycosa
Acantholyctus
Acanthomorphaspiny-rayed teleosts
Acanthomyops
A-arizonicus
A-bureni
A-californicus
A-claviger
A-colei
A-coloradensis
A-creightoni
A-interjectus
A-latipes
A-mexicanus
A-murphyi
A-occidentalis
A-plumopilosus
A-pogonogynus
A-pubescens
A-subglaber
Acanthomyrmex
A-basispinosus
A-careoscrobis
A-concavus
A-crassispinus
A-dusun
A-ferox
A-foveolatus
A-glabfemoralis
A-laevis
A-luciolae
A-mindanao
A-notabilis
A-thailandensis
Acanthopale
A-albosetulosaC. B. Clarke
A-azaleoidesC. B. Clarke
A-buchholziiC. B. Clarke
A-confertifloraC. B. Clarke
A-laxifloraC. B. Clarke
A-pubescensC. B. Clarke
Acanthopidae
Acanthopinae
Acanthoponera
A-goeldii
A-minor
A-mucronata
A-peruviana
Acanthops
A-bidens
A-centralis
A-contorta(incertae sedis)
A-elegans
A-erosa
A-erosula
A-falcata
A-falcata group
A-falcataria group
A-falcatoria
A-fuscifolia
A-godmani
A-occidentalis
A-onorei
A-parafalcata
A-parva
A-royi
A-soukana(incertae sedis)
A-tuberculata
Acanthopsis
A-carduifoliaShinz
A-dispermaNees
A-hoffmannseggianaC. B. Clarke
Acanthopteroctetes aurulenta
Acanthopteroctetes bimaculata
Acanthopteroctetes tripunctata
Acanthopteroctetes unifascia
Acanthopteroctetidae(archaic sun moths)
Acanthopterygii(seahorses, perches, bass, cichlids, tunas, etc.)
Acanthosomatidae(acanthosomatid stink bugs)
Acanthostega(EXTINCT)
Acanthostichus
A-arizonensis
A-bentoni
A-brevicornis
A-brevinodis
A-concavinodis
A-emmae
A-femoralis
A-flexuosus
A-fuscipennis
A-hispaniolicus
A-kirbyi
A-laevigatus
A-laticornis
A-lattkei
A-longinodis
A-punctiscapus
A-quadratus
A-quirozi
A-sanchezorum
A-serratulus
A-skwarrae
A-texanus
A-truncatus
Acanthostigma
Acanthotermes
Acanthus Clade
Acanthus eminensC. B. Clarke
Acanthus ilicifoliusL.
Acanthus longifoliusHost.
Acanthus mollisL.
Acanthus montanus(Nees) T. Anders.
Acanthus pubescens(Oliver) Engler
Acanthus senniiChiovenda
Acanthus spinosusL.
Acantoxyura
Acaratopus
Acari(mites and ticks)
A-formes(The "mite-like" mites)
Acarosporomycetidae
Acartiidae
Acartophthalmidae
Acartophthalmites tertiaria(EXTINCT) (incertae sedis)
Acartophthalmus
A-bicolor
A-latrinalis
A-nigrinus
A-pusio
Acaryon
Acaulospora
Acaulosporaceae
Accipiter
Accipitridae(hawks, eagles, Old World vultures)
Acentrophryne
Acentroscelus
Acerbas
A-anthea
A-azona
A-latefascia
A-martini
A-suttoni
Acerella
Acerentomata
Acerentomidae
Acerentomon
Acerentuloides
Acerentulus
Acetalius
Acetitomaculum
Acetivibrio
Acetoanaerobium
Acetobacterium
Acetofilamentum
Acetogenium
Acetohalobium
Acetomicrobium
Acetonema
Acetothermus
Achaetops(rock-jumper)
Achalarus
A-albociliatus
A-casica
A-lyciades
A-tehuanaca
A-toxeus
Achariaceae(incl. Flacourtiaceae pro parte)
Achatocarpaceae
Achemia
Achenium
A-(Achenium)
A-(Chinachenium)
A-(Micrachenium)
Achenomorphus
A-(Achenomorphus)
A-(Aderocharis)
A-(Dorocharis)
Achenopsis
Achilia
Achilidae
Achilixiidae
Achillidia
Achilliotes
Achlaena grandis
Achlaenella adolphifrederici
Achmonia
Acholeplasma
Acholotermes
Achroblatta(incertae sedis)
Achtherampla
Achylodes
A-busirus
A-pallida
Achylodini
Achyrocalyx decaryiBenoist
Aciculata
Aciculioiditermes
Aciculitermes
Acidaminobacter
Acidaminococcaceae
Acidaminococcus
Acidianus
Acidimicrobiales
Acidnotermes
Acidobacteria(acidophilic bacteria common in soils)
Acidobacterium capsulatum
Acidocerina
Acidocerus
Acidoproctidae
Acidota
Acidothermus
Acipenseridae
Acipenseriformes(sturgeons, paddlefishes)
Acithespis gigas
Acladocera
Acleistorhinus(EXTINCT)
Aclerdidae(grass scales)
Acleros
A-bibundica
A-leucopyga
A-mackenii
A-neavei
A-nigrapex
A-ploetzi
A-sparsum
Aclypea
Acmoeonotus
Acoela
Acolonia
Acomys
Aconoidasida
Aconthiothespis
Acontiaria
Acontiophoridae
Acontiophorum mortenseniCarlgren 1938
Acontiothespinae
Acontista
A-amazonica
A-amoenula
A-brevipennis
A-cayennensis
A-championi
A-chopardi
A-concinna
A-cordillerae
A-cubana
A-ecuadorica
A-eximia
A-festae
A-fraterna
A-inquinata
A-iriodes
A-maroniensis
A-mexicana
A-minima
A-multicolor
A-piracicabensis
A-quadrimaculata
A-rehni
A-semirufa
A-travassosi
A-vitrea
Acontosceles
Acopauropus
Acorhinotermes
Acotreba
Acracanthostoma
Acraea
A-abdera
A-acrita
A-admantha
A-adrasta
A-aganice
A-aglaonice
A-alcinoe
A-andromache
A-anemosa
A-annonae
A-asboloplintha
A-asema
A-atergatis
A-atolmis
A-axina
A-bailundensis
A-bellona
A-boopis
A-braesia
A-brainei
A-buettneri
A-caecilia
A-caldarena
A-camaena
A-cepheus
A-cerasa
A-chaeribula
A-chambezi
A-chilo
A-consanguinea
A-cuva
A-dammii
A-diogenes
A-doubledayi
A-egina
A-ella
A-elongata
A-eltringhami
A-eltringhamiana
A-endoscota
A-epaea
A-epiprotea
A-equatorialis
A-eugenia
A-excisa
A-formosa
A-guillemei
A-guluensis
A-hamata
A-horta
A-hova
A-hypoleuca
A-igati
A-indentata
A-insignis
A-intermedioides
A-issoria
A-kappa
A-kia
A-kinduana
A-kraka
A-lapidorum
A-leopoldina
A-leucographa
A-leucopyga
A-lofua
A-loranae
A-lualabae
A-lygus
A-macaria
A-macarista
A-machequena
A-mahela
A-manca
A-mansya
A-marnois
A-matuapa
A-medea
A-meyeri
A-mirabilis
A-miranda
A-moluccana
A-natalica
A-neobule
A-niobe
A-nohara
A-obliqua
A-omrora
A-oncaea
A-onerata
A-oscari
A-overlaeti
A-periphanes
A-persanguinea
A-petraea
A-poggei
A-pseudatolmis
A-pseudegina
A-pseuderyta
A-pseudolycia
A-pudorella
A-pudorina
A-punctellata
A-punctimarginea
A-quadricolor
A-quirina
A-rabbaia
A-ranavalona
A-rhodesiana
A-rogersi
A-rohlfsi
A-satis
A-scalivittata
A-simulator
A-stenobea
A-sykesi
A-tellus
A-terpsicore
A-turlini
A-turna
A-umbra
A-utengulensis
A-vestalis
A-violae
A-violarum
A-zetes
A-zonata
Acraeini
Acraga
A-amazonica
A-ampela
A-andina
A-angulifera
A-beebei
A-boliviana
A-brunnea
A-chicana
A-ciliata
A-citrina
A-citrinopsis
A-coa
A-concolor
A-conda
A-ferruginea
A-flava
A-goes
A-hamata
A-hoppiana
A-infusa
A-ingenescens
A-isothea
A-leberna
A-luteola
A-mariala
A-melinda
A-meridensis
A-moorei
A-neblina
A-obscura
A-ochracea
A-parana
A-perbrunnea
A-philetera
A-puno
A-ria
A-serrata
A-sexquicentenaria
A-umbrifera
A-victoria
Acragas
A-carinatus
A-castaneiceps
A-erythraeus
A-fallax
A-flavescens
A-hieroglyphicus
A-humaites
A-humilis
A-leucaspis
A-longimanus
A-longipalpus
A-mendax
A-miniaceus
A-nigromaculatus
A-pacatus
A-peckhami
A-phasianius
A-procalvus
A-quadriguttatus
A-rosenbergi
A-trimaculatus
A-zeteki
Acraginae
Acraspedanthus
A-elongatusCarlgren 1924
Acremodactyla ambonenseKwietniewski 1897
Acrididae
Acridinae(non-monophyletic)
Acridoideas. n.
Acris
Acritini
Acritomorphini
Acrocarpospora
Acrocephalidae(acrocephaline warblers)
Acroceridae
Acrochaetiales
Acrocomus
Acrocyusa
Acrodimerus
Acrodonta
Acrolepidae(EXTINCT)
Acrolocha
Acrolophidae
Acromantinae
Acromantis
A-australis
A-dyaka
A-elegans
A-formosana
A-gestri
A-grandis
A-hesione
A-indica
A-insularis
A-japonica
A-lilii
A-luzonica
A-montana
A-moultoni
A-nicobarica
A-oligoneura
A-palauana
A-philippina
A-satsumensis
A-siporana
Acromyrmex
A-ambiguus
Acroneuria
Acroneuriinae
Acroneuriini
Acrophtalmia
A-artemis
A-leuce
Acrophthalmia windorum
Acropolis
Acroporoblatta
Acropyga
A-(Acropyga)
A-(Atopodon)
A-(Malacomyrma)
A-(Rhizomyrma)
Acrostiba
Acrostilicus
Acrothoracica
Acrotona
A-(Acrotona)
A-(Aremia)
A-(Arisota)
A-(Colpodota)
A-(Dolosota)
A-(Eurypronota)
A-(Neada)
A-(Reania)
Acrotrichinae
Acrotrichis
Acrotrychiopsis
Acrulia
Acruliopsis
Acryllium vulturinum(Vulturine Guineafowl)
Actaletidae
Actenoides
Acteocemas(EXTINCT)
Acthelmis
Actiastes
Acticola
Actidium
Actinauge
A-abyssorumCarlgren 1934
A-bockiCarlgren 1943
A-granulataCarlgren 1928
Actinauge nexilisVerrill 1883
Actinauge nodosa var. coronataVerrill 1883
A-verrilliiMc Murrich 1893
Actineria
A-dendrophoraHaddon and Shackleton 1893
Actinernidae
Actinernus
Actinernus Verrilli[sic] Gravier 1918
Actinernus aureliaStephenson 1918
A-michaelsarsiCarlgren 1918
A-nobilisVerrill 1879
Actinernus obesa(Verrill?)
Actinernus plebeiaMc Murrich [sic] 1893
Actinernus saginataVerrill 1882
Actinia
A-Grobbeni[sic] Watzl 1922
Actinia Helianthus[sic] Hemprich and Ehrenberg, Ehrenberg 1834
Actinia Thomsoni[sic] Coughtrey 1874
Actinia Tuediae[sic] Johnston 1832
Actinia achatesDana 1849
Actinia adherensp. p. Ehrenberg 1834
Actinia alcyonidiumQuoy and Gaimard 1833
Actinia annulataLeseur 1817
Actinia arboreumQuoy and Gaimard 1833
Actinia artemisiaDana 1849 [sic]
Actinia aurantiacaDelle Chiaje 1825
Actinia auroraQuoy and Gaimard 1833
Actinia balliiCocks 1849
Actinia capensisLesson 1830
A-cariDelle Chiaje 1841
Actinia cavernataBosc 1802
Actinia chilensisLesson 1830
Actinia clavusQuoy and Gaimard 1833
Actinia clematisDana 1849
Actinia coccineaMueller 1776
Actinia coeruleusQuoy and Gaimard 1833
Actinia crispusEhrenberg 1834
Actinia cruciferLeseur 1817
Actinia cruentataDana 1849
Actinia crysanthellumPeach in Johnston 1847
Actinia decoraEhrenberg 1834
Actinia decorataDana 1849
Actinia diademaDana 1849
Actinia diaphanaRapp 1829
Actinia digitataO. F. Mueller 1776
Actinia elegansDalyell 1848
Actinia elongataDelle Chiaje 1825
A-equinaLinne 1758
Actinia erythrosomaHemprich and Ehrenberg 1851
Actinia felinaLinne 1767
Actinia flosculiferaLeseur 1817
Actinia granuliferaLeseur 1817
Actinia helianthusEllis 1767
Actinia impatiensin Dana 1849
Actinia infecundaMc Murrich [sic] 1893
Actinia inornataStimpson 1855
Actinia intestinalisFabricius 1780
A-kraemeriPax 1914
Actinia laceratusDalyell 1848
A-melanasterVerrill 1901
Actinia mutabilisGravenhorst 1831
Actinia niveusCarlgren 1899
Actinia nodosaFabricius 1780
Actinia ocellataLesson 1830
Actinia olivaceaLeseur 1817
Actinia parasiticaCouch 1838
Actinia parvitentaculataQuoy and Gaimard 1833
Actinia pedunculatusPennant 1777
Actinia pretiosaDana 1849
Actinia proliferaM. Sars 1835
Actinia pustulataDana 1849
Actinia quadricolorLeuckarl [sic] in Rueppel 1828
Actinia rapiformisSchmarda 1852
Actinia sanctae helenaeLesson 1830
Actinia senileLinneus 1767
Actinia sipunculoidesStimpson 1853
Actinia stellulaEhrenberg 1834
Actinia sulcataPennant 1766
Actinia tapetumEhrenberg 1834
A-tenebrosaFarquhar 1898
Actinia tricolorLeseur 1817
Actinia troglodytesPrice in Johnston 1847
Actinia tuberculosaQuoy and Gaimard 1833
Actinia ultramarinaLeseur 1817
Actinia undatusO. F. Mueller 1788
Actinia verrucosaPennant 1777
Actinia viduatusO. F. Mueller 1776
Actinia villosaQuoy and Gaimard 1833
Actinia xanthogrammicaBrandt 1835
Actiniaria(monophyly uncertain)
Actinidiaceae
Actiniidae
Actiniogeton
Actinioides Sesere[sic] Haddon and Shackleton 1893
Actinioides africanaCarlgren 1900
Actinioides ambonensisKwietniewski 1898
Actinioides dixonianaHaddon and Shackleton 1893
Actinioides papuensisHaddon 1898
Actinioides rapanuiensisCarlgren 1920
Actinioides spenceriHaddon and Duerden 1896
Actinioides sultanaCarlgren 1900
Actinoalloteichus
Actinobacteria(high G+C Gram positives)
Actinobaculum
Actinoceratoidea(EXTINCT)
Actinocorallia
Actinodendron
A-glomeratumHaddon 1898
A-hansingorumCarlgren 1900
Actinodendron loligoH. and E. Ehrenberg 1834
A-plumosumHaddon 1898
Actinodendronidae
Actinohymen(EXTINCT)
Actinoides haddoniKwietniewski 1897
Actinokineospora
Actinomadura
Actinomorphus
Actinomyces
Actinomycetales
Actinomycineae
Actinoplanes
Actinopodidae
Actinopolymorpha
Actinopolyspora
Actinoporus
A-elegansDuchassaing 1850
A-elongatusCarlgren 1900
Actinopsis roseaStuder 1878
Actinopterygii(ray-finned fishes)
Actinopteryx
Actinor
Actinoscyphia
Actinostella formosaDuchassaing 1850
Actinostephanus
A-haeckeliKwietniewski 1897
Actinostola
A-groenlandicaCarlgren 1899
A-carlgreniWasilieff [sic] 1908
A-clubbiCarlgren 1927
A-excelsaMc Murrich [sic] 1893
A-georgianaCarlgren 1927
A-intermediaCarlgren 1899
A-kerguelensisCarlgren 1928
A-pergamentaceaMc Murrich [sic] 1893
A-spetsbergensisCarlgren 1893
Actinostolidae
Actinosynnema
Actinote
A-acerata
A-actinotina
A-acuta
A-alalia
A-alciope
A-alciopoides
A-alicia
A-althoffi
A-amicitiae
A-anacreon
A-ansorgei
A-anteas
A-aubyni
A-aurivillii
A-baxteri
A-bergeri
A-bonasia
A-bonita
A-brylla
A-burgessi
A-buschbecki
A-cabira
A-calida
A-canutia
A-carycina
A-catarina
A-cinerea
A-circeis
A-conradti
A-conspicua
A-dalmedai
A-discrepans
A-disjuncta
A-encedana
A-encedon
A-encoda
A-eponina
A-esebria
A-excelsior
A-fornax
A-genitrix
A-goetzi
A-grosvenori
A-guatemalena
A-guichardi
A-hecqui
A-humilis
A-igola
A-insularis
A-iturina
A-jodutta
A-johnstoni
A-kaduna
A-kalinzu
A-kuekenthali
A-lapitha
A-latior
A-lia
A-lumiri
A-lycoa
A-mamita
A-masamba
A-melampeplos
A-melanisans
A-melanoxantha
A-mirifica
A-morio
A-necoda
A-newtoni
A-ntebiae
A-obeira
A-oberthueri
A-oreas
A-orestia
A-orina
A-orinata
A-parapheles
A-parrhasia
A-peetersi
A-pellenea
A-pelopeia
A-peneleos
A-penelope
A-pentapolis
A-perenna
A-pharsalus
A-pierrei
A-quadra
A-quirinalis
A-rahira
A-rangatana
A-rhodope
A-rileyi
A-rufina
A-safie
A-sambavae
A-semivitrea
A-servona
A-siliana
A-simulata
A-sotikensis
A-strattipocles
A-surima
A-thalia
A-ungemachi
A-uvui
A-ventura
A-vesperalis
A-viviana
A-vuilloti
A-wigginsi
A-zikani
A-zitja
Actinothoe
A-Milmani[sic] Haddon and Shackleton 1893
A-californicaCarlgren 1940
Actinothoe californicusCarlgren 1940
Actinus
Actionoma
Actium
Actizona
Actocharina
Actocharis readingii
Actophylla
Aculeata
Aculomicrus
Acutidentitermes
Acutogordius
Acyclus
Acylobythus
Acylohsellus
Acylophorus
A-(Acylophorus)
A-(Amacylophorus)
A-(Indoacylophorus)
A-(Neoacylophorus)
A-(Palpacylophorus)
A-(Paracylophorus)
Acylopselaphus
Acylotyrus
Adaiphrotermes
Adalmus
Adamsia
Adamsia fuscaMilne-Edwards 1857
Adamsia involvensMc Murrich [sic] 1893
A-sociabilisVerrill 1882
Adapisoricidae(EXTINCT)
Adapisoriculidae(EXTINCT)
Adda
Addax nasomaculatus(addax)
Adeheterothripidae
Adela
Adelarthra
Adelgidae(pine and spruce aphids)
Adelidae(longhorned fairy moths)
AdelieledoneAllcock, Hochberg, Rodhouse and Thorpe, 2003
Adeliinae
Adelocosa
Adelogyrinidae(EXTINCT)
Adelomyrmex(incertae sedis)
A-betoi
A-biroi
A-boltoni
A-brevispinosus
A-costatus
A-cristiani
A-foveolatus
A-grandis
A-hirsutus
A-laevigatus
A-longinodus
A-longinoi
A-mackayi
A-micans
A-microps
A-minimus
A-myops
A-robustus
A-samoanus
A-silvestrii
A-striatus
A-tristani
A-vaderi
Adelophthalmidae(EXTINCT)
Adelopidius
Adelopsella
Adelopsis
Adelotopus
Adelotus
Adelotypa
A-amasis
A-aminias
A-annulifera
A-argiella
A-aristus
A-asemna
A-balista
A-bolena
A-borsippa
A-charessa
A-curulis
A-densemaculata
A-epixanthe
A-eudocia
A-glauca
A-huebneri
A-jasonhalli
A-lampros
A-leucocyana
A-leucophaea
A-malca
A-mollis
A-pauxilla
A-penthea
A-sejuncta
A-tinea
A-trinitatis
A-violacea
A-zerna
Adelpha
A-abia
A-abyla
A-alala
A-amazona
A-argentea
A-aricia
A-atlantica
A-attica
A-barnesia
A-basiloides
A-boeotia
A-boreas
A-bredowii
A-calliphane
A-capucinus
A-cocala
A-corcyra
A-coryneta
A-cytherea
A-delinita
A-demialba
A-diazi
A-diocles
A-donysa
A-epione
A-epizygis
A-erotia
A-erymanthis
A-ethelda
A-fabricia
A-falcipennis
A-felderi
A-fessonia
A-gavina
A-gelania
A-heraclea
A-herbita
A-hesterbergi
A-hyas
A-iphicleola
A-iphiclus
A-irmina
A-jordani
A-justina
A-lamasi
A-leuceria
A-leucerioides
A-leucophthalma
A-levona
A-lycorias
A-malea
A-melona
A-mesentina
A-messana
A-milleri
A-mythra
A-naxia
A-nea
A-olynthia
A-paraena
A-paroeca
A-phylaca
A-pithys
A-plesaure
A-pollina
A-poltius
A-radiata
A-rothschildi
A-salmoneus
A-salus
A-saundersii
A-seriphia
A-serpa
A-shuara
A-sichaeus
A-stilesiana
A-syma
A-thesprotia
A-thessalia
A-thoasa
A-tracta
A-viola
A-ximena
A-zea
A-zina
Adelphohemerobius
Adelphydraena
Ademosyne(EXTINCT)
Ademosynidae(EXTINCT) (incertae sedis)
Ademosynoides(EXTINCT)
Adendrocera
Adenolobus
Adenomera
Adenopleurellidae
Adenoviridae
Adephaga(ground beetles, tiger beetles, whirligigs, etc.)
Aderidae(ant-like leaf beetles)
Aderitotermes
Aderobium
Adesmata
Adesmia clade
Adetomyrma venatrix
Adhavara
Adhesisagitta hispida
Adiaphorostreptidae
Adiastulus
Adicophasma spinosa(EXTINCT)
Adineta
Adinetidae
Adinolepis
A-apodema
A-eumana
A-mathesonae
A-scalena
A-youanga
Adinopsis
A-africana
A-angusta
A-australis
A-bicornis
A-braziliensis
A-cinnamomea
A-cuspidata
A-deckerti
A-devroeyi
A-ferruginea
A-flavicornis
A-groehni(EXTINCT)
A-hammondi
A-maraisi
A-mmabolela
A-myllaenoides
A-ndumu
A-nepalensis
A-rufobrunnea
A-schoutedeni
Adkinsella(EXTINCT)
Adlerodea
A-lemba
A-mineira
A-modesta
A-petrovna
Adlerzia froggatti
Admestina
A-archboldi
A-tibialis
A-wheeleri
Admirala
Adoketoxenus
Adolarryia(EXTINCT)
Adoliadina
Adoliadini
Adolopus
Adopaeoides
A-bistriata
A-prittwitzi
Adota
Adoxa moschatellina
Adoxaceae
Adranina
Adrastia
Adrimus(non-monophyletic)
A-aenescens
A-affinis
A-balli
A-claripes
A-creparus
A-elytralis
A-fuscipes
A-geminatus
A-irideus
A-latibasis
A-longior
A-matoanus
A-microderus
A-olivaceus
A-paulensis
A-proximus
A-rufangulus
A-suturalis
A-uruguaicus
A-ventralis
A-virens
A-viridescens
Adritylidae
Adrocerus
Adrogaster
Adynatotermes
Aeduellidae(EXTINCT)
Aegiale
Aegidae(F.)
Aegisthidae
Aegithalidae(long-tailed tits)
Aegithinidae(ioras)
Aeglidae
Aegolius(Boreal Owl and relatives)
A-acadicus(Northern Saw-whet Owl)
A-funereus(Boreal Owl)
A-harrisii(Buff-fronted Owl)
A-ridgwayi(Unspotted Saw-whet Owl)
Aegothelidae(Owlet-Nightjars)
Aegypius
Aeluropoda
Aemona
A-amathusia
A-lena
Aemulister
Aenea
Aenetus
A-arfaki
A-astathes
A-blackburnii
A-cohici
A-crameri
A-dulcis
A-eugyna
A-eximia
A-hampsoni
A-lewinii
A-ligniveren
A-marginatus
A-mirabilis
A-montanus
A-ombraloma
A-ramsayi
A-scotti
A-scripta
A-sordida
A-splendens
A-tegulatus
A-tephroptilus
A-toxopeusi
A-virescens
Aenictobia
Aenictobiina
Aenictocleptis
Aenictocoris
Aenictocupidus
Aenictogiton
A-attenuatus
A-bequaerti
A-elongatus
A-emeryi
A-fossiceps
A-schoutedeni
A-sulcatus
Aenictonia
Aenictopecheidae
Aenictopechys
Aenictophila
Aenictoteras
Aenictoteratini
Aenictoxenus
Aenictozyras
Aenictus(Old World army ants)
A-abeillei
Aenigmatolimnas marginalis(Striped Crake)
Aeolosomatidae + Potamodrilus
Aeolothripidae
Aepeomys(incertae sedis)
Aepophilidae
Aepsera
Aepycamelus(EXTINCT)
Aepyceros melampus(impala)
Aepyornis(EXTINCT)
Aepyornithidae(EXTINCT) (Elephant Birds) (incertae sedis)
Aepypodius
A-arfakianus(Wattled Brushturkey)
A-bruijnii(Waigeo Brushturkey)
Aequorivita
Aeretes
Aeria
A-elara
A-eurimedia
A-olena
Aeriscardovia
Aerococcus
Aeromachini
Aeromachus
A-catocyanea
A-cognatus
A-dubius
A-inachus
A-jhora
A-kali
A-monstrabilus
A-piceus
A-plumbeola
A-propinquus
A-pseudojhora
A-pygmaeus
A-stigmata
Aeromicrobium
Aeromys
Aeropetes
Aeschronectida(EXTINCT)
Aesopichthyidae(EXTINCT)
Aetalionidae(aetalionid treehoppers)
Aethalochroa
A-affinis
A-ashmoliana
A-insignis
A-simplicipes
A-spinipes
Aethalochroaini
Aethilla
A-chiapa
A-echina
A-eleusina
A-epicra
A-gigas
A-haber
A-later
A-lavochrea
A-melas
A-memmius
Aethomys
Aetideidae
Aetiocetidae(EXTINCT) (non-monophyletic)
Aetosauria(EXTINCT)
Aextoxicaceae
Aextoxicon punctatum(olivillo)
Affinoptochus
Afgekia
Afracus
Afrauropodidae
Afrevania leroyi
Africablatta
Africalolampra0(incertae sedis)
African Lineage(incertae sedis)
African Ruellia(including Eusiphon) (non-monophyletic)
African Series
African golden moles
Africoptilium
Afrixalus
Afroagathidium
Afrobalta
Afrobium
Afrobrachida
Afrocatops
Afrocyrtusa
Afrodotina
Afroleiodes
Afrolimnichus
AfrololigoBrakoniecki, 1986
Afromastacinae
Afromeotica
Afroneura
Afrooreobia
Afropavo congensis(Congo Peacock)
Afropelates
A-joannae
A-latitarsus
A-leleupi
Afrophitodum
Afroplatyola
Afroplectus
A-(Afroplectaulax)
A-(Afroplectidius)
A-(Afroplectodes)
A-(Afroplectus)
Afropselaphus
Afrorabigus
Afroscaphium
Afroscotonomus
Afrosorius
Afrosubulitermes
Afrotheora
A-argentimaculata
A-brevivalva
A-flavimaculata
A-jordani
A-minirhodaula
A-rhodaula
A-thermodes
Afrotis(Black Korhaan)
A-afra(Southern Black Korhaan)
A-afraoides(Northern Black Korhaan)
Afrotormus
Afrotyphlopsis
Afrotyphlus
Afrotyrus
Afroxyidris crigensis
Afzelia
Agacerus
Agalenocosa
Agalmaceros(EXTINCT)
Agalychnis
Agaminae
Agamococcidiorida
Aganotermes
Agaonidae
Agapanthaceae
Agapophytinae
Agaricaceae
Agaricales
A-incertae sedis(non-monophyletic) (incertae sedis)
Agaricioidea
Agaricochara
Agaricomorpha
Agaricomycetes(mushroom-forming fungi)
Agaricomycetidae
Agaricomycotina(jelly fungi, yeasts, and mushrooms)
Agaricophagus
Agassa
Agatasa
Agathemera(chinche moyos)
Agathidiini
Agathidinae
Agathidium
A-(Agathidium)
A-(Chaetoceble)
A-(Cyphoceble)
A-(Euryceble)
A-(Macroceble)
A-(Microceble)
A-(Neoceble)
A-(Rhabdoelytrum)
Agathiphagidae(kauri moths)
Agathymus
A-alliae
A-aryxna
A-baueri
A-belli
A-carlsbadensis
A-chisosensis
A-comstocki
A-dawsoni
A-diabloensis
A-escalantei
A-estelleae
A-evansi
A-fieldi
A-florenceae
A-gentryi
A-gilberti
A-hoffmanni
A-indecisa
A-juliae
A-mariae
A-micheneri
A-neumoegeni
A-polingi
A-remingtoni
A-rethon
A-ricei
A-rindgei
A-stephensi
Agatyrus
Agavaceae
Agavenema
Agdestis clematidea
Agelaioides
A-badius
A-oreopsar
Agelaius
A-assimilis(Red-shouldered Blackbird)
A-humeralis(Tawny-shouldered Blackbird)
A-phoeniceus
A-tricolor
A-xanthomus(Yellow-shouldered Blackbird)
Agelastes meleagrides(White-breasted Guineafowl)
Agelastes niger(Black Guineafowl)
Agelasticus
A-cyanopus
A-thilius
A-xanthophthalmus
Agelenidae(funnel weavers)
Agelista
Agelosus
Agerodes
Ageroniini
Agitococcus
Aglais
Aglaoctenus
Aglaogaster
Aglaophyton major(EXTINCT)
Aglia
Aglyptinus
Aglyptodactylus
Agmoblatta
Agna
Agnaeformia
Agnathiella
Agnathotermes
Agnetina
Agnosiusa
Agnosthaetus
Agnostida(EXTINCT)
Agonica
A-ovalipennisSloane
A-simsoniSloane
A-victoriensisMoore
Agonicina
Agonoxenidae(palm moths)
Agorophiidae(EXTINCT) (non-monophyletic)
Agraphydrus
A-(Agraphydrus)
A-(Gymnhelochares)
Agraulis
Agraulomyrmex
A-meridionalis
A-wilsoni
Agreia
Agrias
A-aedon
A-amydon
A-claudina
A-hewitsonius
A-narcissus
Agrilinae
Agriochoeridae(EXTINCT)
Agriochoerus(EXTINCT)
Agrionopsis
A-brachyptera
A-congica
A-distanti
A-modesta
Agrionympha
Agriothera
Agrococcus
Agroecomyrmecinae
Agroecomyrmex duisburgi(EXTINCT)
Agromyces
Agromyzidae
Aguascalientia(EXTINCT)
Aguna
A-albistria
A-asander
A-aurunce
A-camagura
A-cirrus
A-claxon
A-clina
A-coeloides
A-coelus
A-ganna
A-glaphyrus
A-latifascia
A-latimacula
A-longicauda
A-megaeles
A-mesodentata
A-metophis
A-nicolayi
A-panama
A-parva
A-penicillata
A-similis
A-spatulata
A-spicata
A-squamalba
A-venezuelae
Agyriales
Agyrtes
A-(Agyrtecanus)
A-(Agyrtes)
Agyrtidae(primitive carrion beetles)
Agyrtinae
Agyrtodes
A-atropos
A-bicolor
A-crassus
A-decoratus
A-disparatus
A-eucalypti
A-hunuensis
A-koebeli
A-labralis
A-monticola
A-nebulosus
A-nemoralis
A-ovatus
A-tasmanicus
A-variegatus
Agyrtodini
Agyrtolasia
Ahamitermes
Ahmaditermes
Ahnfeltiales
Aidanosagitta
A-alvarinoae
A-bedfordi
A-crassa
A-delicata
A-demipenna
A-erythraea
A-guileri
A-johorensis
A-neglecta
A-oceania
A-ophicephala
A-regularis
A-septata
A-tropica
Aides
A-aegita
A-aestria
A-brilla
A-brino
A-duma
A-dysoni
A-ocrinus
Aididae
Aillutticus
A-brutus
A-nitens
A-pinquidor
A-rotundatus
Aiptasia
A-californicaCarlgren 1949
A-carneaAndres 1880
A-insignisCarlgren 1941
A-leiodactylaPax 1910
Aiptasia lucidaPax 1910
Aiptasia minimaStephenson 1918
A-parvaCarlgren 1938
Aiptasia peruvianaPax 1912
A-pulchellaCarlgren 1943
A-saxicolaAndres 1880
Aiptasia sp.? (tagetes)Pax 1910
Aiptasiidae
Aiptasioides primaStephenson 1918
Aiptasiomorpha elongataCarlgren 1949
Aiptasiomorpha paxiStephenson 1920
Aiptasiomorphidae
Aisthentusa
Aistopoda(EXTINCT)
Aix(Wood Duck and Mandarin Duck)
A-galericulata(Mandarin Duck)
A-sponsa(Wood Duck)
Aizoaceae(stone plant family)
Akaniaceae
Akaniblatta
Akanthoystera
Akatastopsisini(incertae sedis)
Akentrobuthus
Akentrogonida
Akephorus
Akicerinae
Akodon sensu stricto
Akodontini(South American field mice)
Akrincastiba
Aksyiria(EXTINCT)
Akysidae
Alacran
Alaena
A-amazoulathe Yellow Zulu
A-bicolora
A-bjornstadti
A-brainei
A-caissa
A-dodomaensis
A-ferrulineata
A-interposita
A-johanna
A-kiellandi
A-lamborni
A-maculata
A-madibirensis
A-margaritacea
A-ngonga
A-nyassa
A-oberthuri
A-ochracea
A-picata
A-reticulata
A-rosei
Alaena section(monophyly uncertain)
A-subruba
A-unimaculosa
Alainosquillidae
Alalomantis
A-coxalis
A-muta
Alangium
Alania deliquata
Alaskaentomon
Alatotrochus
Alaudidae(larks)
Alayotityus
Albaniola
Albanodirus
Albertia
Albertosaurus sarcophagus(EXTINCT)
Albionbatrachus(EXTINCT)
Albireonidae(EXTINCT)
Albulidaebonefishes
Albuliformesbonefishes, halosaurs
Albuneidae
Alcedinidae(kingfishers)
Alcedininae
Alcedo
Alcelaphinae(hartebeests, wildebeests, and sassabies)
Alcelaphus buselaphus(hartebeest)
Alces alces(moose)
Alcidae(auks)
Alcimochthes
Alcyonaria(soft corals, sea pens)
Aldania
A-ilos
A-imitans
A-raddei
A-themis
A-thisbe
A-yunnana
Alectoneura(EXTINCT)
Alectoneuridae
Alectoris(Rock Partridge and relatives)
A-barbara(Barbary Partridge)
A-chukar(Chukar Partridge)
A-graeca(Rock Partridge)
A-magna(Przevalski's Partridge)
A-melanocephala(Arabian Partridge)
A-philbyi(Philby's Partridge)
A-rufa(Red-legged Partridge)
Alectrosaurus olseni(EXTINCT)
Alectura lathami(Australian Brushturkey)
Alenia
A-namaqua
A-sandaster
Aleochandria
Aleochara
A-(Aidochara)
A-(Aleochara s. str.)
A-(Calochara)
A-(Ceranota)
A-(Coprochara)
A-(Echochara)
A-(Emplenota)
A-(Euryodma)
A-(Heterochara)
A-(Maseochara)
A-(Megalogastria)
A-(Mesochara)
A-(Polystomota)
A-(Rheochara)
A-(Triochara)
A-(Xenochara s.l.)
A-? semicarinata0(incertae sedis)
A-albopila
A-angusticollis
A-argentina0(incertae sedis)
A-asperata
A-bilineata
A-bimaculata
A-binotata
A-bipustulata
A-bisolata
A-brundini
A-brunneipennis
A-comorensis0(incertae sedis)
A-composita0(incertae sedis)
A-curtidens
A-densissima
A-depressa
A-duplicata
A-fenyesi
A-freyi
A-fucicola
A-gracilis
A-granulicauda
A-grisea
A-hluhluwe
A-horni
A-ituriensis
A-javana
A-lindbergi
A-lineatocollis
A-littoralis
A-lobata
A-lucifuga
A-mutare
A-notula
A-nubis
A-obscurella
A-ocularis
A-opacella
A-pacifica
A-pamirensis0(incertae sedis)
A-pauxilla
A-phycophila
A-polychroma0(incertae sedis)
A-puetzi
A-punctatella
A-reinigi
A-robusta0(incertae sedis)
A-salsipotens
A-solieri
A-squalithorax
A-sublaevipennis
A-suffusa
A-sulcicollis
A-trisulcata
A-valida
A-verna
A-wickhami
A-zerchei
Aleocharina
Aleocharinae
Aleocharini
Aleodorus
Alera
A-furcata
A-haworthiana
A-manu
A-metallica
A-romeroi
A-vulpina
Alesa
A-amesis
A-fournierae
A-hemiurga
A-lipara
A-prema
A-rothschildi
A-telephae
A-thelydrias
Aleurodaphis
Aleurodicinae
Alevonota
Alexahymen(EXTINCT)
Alexidia
Alexiidae
Aleyrodidae(whiteflies)
Aleyrodinae
Alfocalea
Alforjas(EXTINCT)
Alfredistia reticulata(incertae sedis)
Algia
A-fasciata
A-felderi
A-satyrina
Algiachroa
Algidus
Algodontodes
Algodontus
Algon
Alianta
Alicia
A-beebeiCarlgren 1940
A-mirabilisJohnson 1861
A-rhadinaHaddon and Shackleton 1893
A-sansibarensisCarlgren 1900
A-uruguayensisCarlgren 1927
Aliciella
Aliciidae
Alicyclobacillus
Alienates
Alienister
Alioramus remotus(EXTINCT)
Alisalia
Alismataceae
Alismatanae
Alistipes
Alkalibacterium
Alkaliphilus
All other Euphasmida
Allacta
Allancastria
A-caucasica
A-cerisy
A-cretica
A-deyrollei
A-louristana
Allantactis
A-parasiticaDanielssen 1890
Allardiana
Allenichthys
Allenopithecus
Alliaceae
Allisonella
Alloblatta
Allobrox
Allocaenelaphus(EXTINCT)
Allocapnia
A-aurora
A-brooksi
A-cunninghami
A-curiosa
A-forbesi
A-frisoni
A-frumi(incertae sedis)
A-fumosa
A-granulata
A-harperi(incertae sedis)
A-illinoensis
A-indianae
A-jeanae
A-loshada
A-malverna
A-maria
A-minima
A-mohri
A-mystica
A-nivicola
A-ohioensis
A-oribata(incertae sedis)
A-ozarkana
A-pechumani
A-peltoides
A-perplexa
A-polemistis
A-pygmaea
A-recta
A-rickeri
A-sandersoni
A-simmonsi(incertae sedis)
A-smithi
A-stannardi
A-tennessa
A-unzickeri
A-virginiana
A-vivipara
A-warreni
A-wrayi
A-zekia
A-zola
Allocapniella(incertae sedis)
Allocebus trichotis(hairy-eared dwarf lemur )
Allocinopus0(incertae sedis)
Alloclemensia
Alloclubionoides
Alloclusia
Allococalodes
Allocolenisia
Allocosa
Allocotocerus
Allodalminiastes
Allodapini
Allodinarda
Allodinopsis0(incertae sedis)
A-howdeni
A-pecki
Allodontermes(incertae sedis)
Allodrepa
Alloformica
A-aberrans
A-flavicornis
A-nitidior
A-obscurior
Allofustis
Allognathotermes
Allogonus
Allohoraeomorphus
Alloiococcus
Alloiodites
Alloiomma changweiensis(EXTINCT) (incertae sedis)
Allolinus
Allomelba
Allomerus
A-decemarticulatus
A-octoarticulatus
A-vogeli
Allomethus
A-brimleyi
A-catharinensis
A-mysticus
A-rotundicornis
A-unicicolis
Allometopon
Allopaederus
Allopalaeophonidae(EXTINCT)
Allopauropus
Alloperla
Alloperlini
Allophryne
Allophryne ruthveni
Allophyllum
Alloplandria
Alloplectus
Allopocockiidae
Allopogonia
AlloposidaeVerrill 1881
Alloproteinus
Allora
A-doleschallii
A-major
Alloraphes
Allosauroidea(EXTINCT)
Allosorius
Allotermes
AlloteuthisWulker, 1920
A-africanus
A-media
A-subulata
Allothrissopidae(EXTINCT)
Allotinus
A-(Allotinus)
A-(Fabitaras)
A-(Paragerydus)
A-agnolia
A-albatus
A-albifasciatus
A-apries
A-bidiensis
A-borneensis
A-brooksi
A-corbeti
A-davidis
A-drumila
A-fabius
A-fallax
A-horsfieldi
A-leogoron
A-macassarensis
A-major
A-maximus
A-nicholsi
A-nigritus(incertae sedis)
A-nivalis
A-paetus(incertae sedis)
A-panormis(incertae sedis)
A-parapus
A-portunus
A-posidion(incertae sedis)
A-samarensis
A-sarrastes
A-strigatus
A-substrigosus
A-subviolaceus
A-taras
A-thalebanus(incertae sedis)
A-unicolor
Allotrichus
Allotrimium
Allotriopus
A-(Mayaferonia)
AM-aeniola
AM-triunfo
A-(s.str.)
AS-ashei
AS-brachypterus
AS-hallbergi
AS-hemingi
AS-oscitans
AS-serratipes
AS-shpeleyi
AS-whiteheadi
Allotrochosina
Allotrochus
Allotyphlus
A-(Allotyphlus)
A-(Moreotyphlus)
Alluaudellina
AlluroteuthisOdhner, 1923
Almeidaia
Almoria
Aloconota
A-(Aloconota)
A-(Disopora)
A-(Taphrodota)
A-(Terasota)
Aloeides
Alomacrotona
Alomaina
Alopecosa
Alopecosella
Alopochen aegyptiaca(Egyptian Goose)
Alouatta
Aloxomidus
Alphacryptovirus
Alphaentomopoxvirus
Alphaherpesvirinae
Alphalipothrixvirus
Alphapapillomavirus
Alpharetrovirus
Alpinia
A-(Alpinia)
A-(Petrammostiba)
Alseuosmiaceae
Alsteinia
Alstonitermes
Alstroemeriaceae
Altaiodromicus
Altaioniphetodes
Altajellidae
Altellopsis
Althansia(EXTINCT) (incertae sedis)
Altiapa
A-colorata
A-decolor
A-klossi
A-pandora
Altingiaceae
Altinote
A-alcione
A-anaxo
A-callianthe
A-dicaeus
A-eresia
A-griseata
A-hilaris
A-momina
A-negra
A-neleus
A-ozomene
A-rubrocellulata
A-stratonice
A-tenebrosa
A-trinacria
Altirana
Altopedaliodes(incertae sedis)
A-cocytia
A-kruegeri
A-kurti
A-nebris
A-pasicles
A-perita
A-reissi
A-tamaensis
A-tena
A-zsolti
Alucitidae(many-plumed moths)
Alucitoidea(many-plumed moths and false plume moths)
Alvaradoa
Alvarezsauridae(EXTINCT)
Alveolates(dinoflagellates, ciliates, apicomplexa)
Alveolocyathus(EXTINCT)
Alydidae(broad-headed bugs)
Alyscotermes
Alysiinae
Alytes
Alzada
Alzadaesthetini
Alzateaceae
Amalocera
Amaloceromorpha
Amalotermes
Amanitaceae
Amanota
Amantis
A-aeta
A-aliena
A-basilana
A-biroi
A-bolivarii
A-fuliginosa
A-fumosa
A-gestri
A-hainanensis
A-indica
A-irina
A-lofaoshanensis
A-longipennis
A-malabarensis
A-malayana
A-nawai
A-philippina
A-reticulata
A-saussurei
A-subirina
A-testacea
A-tristis
A-vitalisi
Amara
Amaralia
A-'oviraptor'new species
A-hypsiura(Kner, 1855)
Amaranthaceae(including Chenopodiaceae)
Amarochara
Amarotypini
Amaryllidaceae
Amarynthis
Amastigomonas
A-bermudensis
A-debruynei
A-filosa
A-gigantea
A-griebensis
A-klosteria
A-marina
A-muscula
A-mutabilis
A-terricola
Amathusia
A-andamanensis
A-binghami
A-friderici
A-masina
A-ochraceofusca
A-perakana
A-phidippus
A-schoenbergi
A-taenia
A-virgata
Amathusiini
Amathuxidia
A-amythaon
A-morishitai
A-plateni
Amauris
A-albimaculata
A-comorana
A-crawshayi
A-damocles
A-dannfelti
A-echeria
A-ellioti
A-hecate
A-inferna
A-niavius
A-nossima
A-ochlea
A-phoedon
A-tartarea
A-vashti
Amaurobiidae
Amaurobius
Amaurodera
Amaurolimnas concolor(Uniform Crake)
Amauronyx
Amauropini
Amaurops
Amauropus
Amaurornis(Brown Bush-hen and relatives)
A-akool(Brown Bush-hen)
A-flavirostra(Black Crake)
A-isabellina(Isabelline Bush-hen)
A-magnirostris(Talaud Bush-hen)
A-olivacea(Plain Bush-hen)
A-olivieri(Sakalava Rail)
A-phoenicurus(White-breasted Waterhen)
Amazoncharis
Amazonentulus
Amazonetta brasiliensis(Brazilian Teal)
Amazonina
Amazonopora
Amazunculus
A-besti
A-claripennis
A-platypodus
Ambalavoa
Ambanus
Ambermantis wozniaki(EXTINCT)
Ambicocerina
Ambicocerodes
Ambicoceropsis
Ambicocerus
Ambivia
A-parapopa
A-undata
Amblopusa
Amblybatrisus
Amblycera
Amblycercus holosericeus(Yellow-billed Cacique)
Amblycipitidae
Amblyopinina
Amblyopinodes
Amblyopinus
Amblyopone(monophyly uncertain)
A-oregonensis
A-pallipes
Amblyoponinae
Amblyoponiphilus
Amblyothele
Amblypygi(tailless whipscorpions)
Amblyramphus holosericeus(Scarlet-headed Blackbird)
Amblyscirtes
A-aenus
A-aesculapius
A-alternata
A-anubis
A-belli
A-brocki
A-carolina
A-cassus
A-celia
A-elissa
A-eos
A-exoteria
A-fimbriata
A-florus
A-fluonia
A-folia
A-hegon
A-linda
A-nereus
A-novimmaculatus
A-nysa
A-oslari
A-patriciae
A-phylace
A-raphaeli
A-reversa
A-simius
A-texanae
A-tolteca
A-vialis
Amblysomus (Amblysomus)
Amblysomus (Neamblysomus)
Amblysomus gunningi
Amblysomus hottentotus
Amblysomus iris
Amblysomus julianae
Amblysomus septentrionalis
Amblytelina
Amblytelini
Amblytelus
Ambodina
Amboneura(EXTINCT)
Amboneuridae
Amborella trichopoda
Ambositrinae
Ambracyptus(EXTINCT)
Ambrosiger
Ambuloasteroidea
Ambunguipedidae
Ambystoma amblycephalum
Ambystoma andersoni
Ambystoma annulatum
Ambystoma barbouri
Ambystoma bombypellum0(incertae sedis)
Ambystoma californiense
Ambystoma cingulatum
Ambystoma dumerilii
Ambystoma flavipiperatum
Ambystoma gracile
Ambystoma granulosum
Ambystoma hibbardi(EXTINCT)0(incertae sedis)
Ambystoma jeffersonianum
Ambystoma kansaense(EXTINCT)0(incertae sedis)
Ambystoma lacustre0(incertae sedis)
Ambystoma larmaensis
Ambystoma laterale
Ambystoma mabeei
Ambystoma macrodactylum
Ambystoma maculatum
Ambystoma mexicanum
Ambystoma minshalli(EXTINCT)0(incertae sedis)
Ambystoma opacum
Ambystoma ordinarium
Ambystoma rosaceum
Ambystoma talpoideum
Ambystoma taylori
Ambystoma texanum
Ambystoma tigrinum
Ambystoma tiheni(EXTINCT)0(incertae sedis)
Ambystoma velasci
Ambystomatidae
Ambystomichnus montanensis(EXTINCT)0(incertae sedis)
Amdovirus
Ameipseusa
Ameiridae
Ameiurus
A-brunneus
A-catus
A-melas
A-natalis
A-nebulosus
A-platycephalus
A-serracanthus
Ameles
A-aegyptiaca
A-africana
A-arabica
A-assoi
A-crassinervis
A-cyprica
A-decolor
A-dumonti
A-fasciipennis
A-gracilis
A-heldreichi
A-kervillei
A-limbata
A-maroccana
A-modesta
A-moralesi
A-persa
A-picteti
A-poggii
A-spallanzania
A-syriensis
A-taurica
A-wadisirhani
Ameletopsidae
Amelinae(non-monophyletic)
Amelinus
AmeloctopusNorman, 1992
Amenis
Amerilox clade
Ameristoglossa
Amerizus
A-(Gnatholymnaeum) blackburni
A-(Tiruka)
A-oblonguloides
A-oblongulum
A-spectabile
A-wingatei
Ametor
Ametretus(EXTINCT) (incertae sedis)
Ametropodidae
Amherstia
Amichrotus
Amicotermes
Amicrocentrinae
Amidobia
Amiiformes(bowfins)
Aminobacterium
Aminomonas
Aminosimus
A-(Aminosimus)
A-(Plectasymus)
Amintinus
Amischa
Amitermes
Amitermes group
Ammobatini
Ammobatoidini
Ammodorcas clarkei(dibatag)
Ammonifex
Ammoniphilus
Ammonoidea(EXTINCT)
Ammoperdix(See-see Partridge and Sand Partridge)
A-griseogularis(See-see Partridge)
A-heyi(Sand Partridge)
Ammospermophilus(antelope ground squirrels)
Ammostyphrus(1 species)
Ammotheidae(non-monophyletic)
Ammotragus lervia(aoudad or Barbary sheep)
Ammotrecha
Ammotrechella
Ammotrechesta
Ammotrechidae
Ammotrechinae
Ammotrechinus
Ammotrechona
Ammotrechula
Ammoxenidae
Amniota(reptiles, mammals, birds, dinosaurs, etc.)
Amnosia decora
Amolops
Amorpheae
Amorphoid clade
Amorphomerini
Amorphopinae
Amorphoscelidae
Amorphoscelinae
Amorphoscelis
A-abyssinica
A-angolica
A-annulicornis
A-austrogermanica
A-borneana
A-brunneipennis
A-ceylonica
A-chinensis
A-chopardi
A-elegans
A-griffini
A-grisea
A-javana
A-lamottei
A-laxeretis
A-machadoi
A-naumanni
A-nigriventer
A-nubeculosa
A-opaca
A-orientalis
A-pallida
A-pantherina
A-papua
A-parva
A-pellucida
A-philippina
A-pulchella
A-pulchra
A-punctata
A-reticulata
A-rufula
A-siebersi
A-singaporana
A-spinosa
A-subnigra
A-tigrina
A-tuberculata
A-villiersi
Amorphoscelites sharovi(EXTINCT) (Lower Cretaceous of Siberia)
Amousus(EXTINCT) (incertae sedis)
Amphasia
Amphecostephanus rex
Ampheida
Amphianthus
A-armatusCarlgren 1928
A-bathybiumR. Hertwig 1882
A-californicusCarlgren 1936
A-capensisCarlgren 1928
A-ingolfiCarlgren 1942
A-islandicusCarlgren 1942
A-laevisCarlgren 1938
A-michaelsarsiCarlgren 1934
A-natalensisCarlgren 1938
A-norvegicusCarlgren 1942
A-ornatusHertwig 1888
A-radiatusCarlgren 1928
A-rosaceusWasilieff [sic] 1908
A-sanctae helenaeCarlgren 1941
A-valdiviaeCarlgren 1928
A-vermiculatusCarlgren 1942
Amphiaspidida(EXTINCT)
Amphibacillus
Amphibamidae(EXTINCT)
Amphibia
Amphibolusa
Amphicerus
Amphichroum
Amphicyllis
Amphicyonidae(EXTINCT)
Amphidecta
A-calliomma
A-pignerator
A-reynoldsi
Amphidiscophora
Amphidotermes
Amphidraus
A-auriga
A-duckei
A-santanae
Amphiduropsis
Amphiduros
Amphientometae
Amphientomidae
Amphientulus
Amphigerontia
Amphigerontiinae
Amphignathodon
Amphilemuridae(EXTINCT)
Amphiliidae
Amphilina foliacea
Amphilina japonica
Amphilinidea
Amphimerycidae(EXTINCT)
Amphinectidae
Amphinectomys
Amphinemura
Amphinemurinae
Amphinomida
AmphioctopusFisher, 1882
Amphionides
Amphiops
Amphipaussus
Amphipoda
Amphiporidae(non-monophyletic)
Amphiprox(EXTINCT)
Amphirhagatherium(EXTINCT)
Amphironchus
Amphisbaenia(incertae sedis)
Amphiselenis
Amphitasus
Amphithera
AmphitretidaeHoyle, 1886
Amphitretus pelagicus
Amphitretus thielei
Amphitriton brevis(EXTINCT)0(incertae sedis)
Amphiuma antica(EXTINCT) (Middle Miocene of Texas) (incertae sedis)
Amphiuma jepseni(EXTINCT) (Upper Paleocene of Wyoming) (incertae sedis)
Amphiuma means
Amphiuma pholeter
Amphiuma tridactylum
Amphiumidae
Amphizoa davidi
Amphizoa insolens
Amphizoa lecontei
Amphizoa sinica
Amphizoa striata
Amphizoidae
Amphorateuthis alveatusYoung, Vecchione and Roper, 2007
Ampittia
A-capenas
A-dalailama
A-dioscorides
A-maro
A-maroides
A-parva
A-trimacula
A-virgata
Amplectopus
Amplexella
Ampoulitermes
Ampulicidae
Ampullarioidea(monophyly uncertain)
Amriathaea
Amudrocerus
Amyciaea
Amycinae
Amycolatopsis
Amycus
A-annulatus
A-delicatus
A-ectypus
A-effeminatus
A-equulus
A-flavicomis
A-flavolineatus
A-igneus
A-lechugalensis
A-lycosiformis
A-palpinalis
A-patellaris
A-pertyi
A-rufifrons
A-spectabilis
A-thoracicus
A-tristis
Amylocorticium
Amyrmex golbachi
Amysoria
Anabaena
Anabaenopsis
Anabaxis
Anacaena(monophyly uncertain)
Anacaenini(monophyly uncertain)
Anacanthotermes
Anacardiaceae(sumac or poison ivy family)
Anachoropteridaceae(EXTINCT)0(incertae sedis)
Anaclasiger
Anacompsa
Anacroneuria
Anacroneuriini
Anacyptus
Anadaptus
Anaeini
Anaeomorpha splendida
Anaeroarcus
Anaerobacter
Anaerobaculum
Anaerobranca
Anaerococcus
Anaerofilum
Anaeroglobus
Anaerolinea
Anaeromusa
Anaerophaga
Anaeroplasma
Anaerorhabdus
Anaerosinus
Anaerostipes
Anaerotruncus
Anaerovibrio
Anaerovorax
Anagesthes(EXTINCT) (incertae sedis)
Anaglyphites(EXTINCT) (incertae sedis)
Anagonus
Anajapygidae
Anallacta
Analoma
Anama
Anamesia
Anamignusa
Anamiopteryx(monophyly uncertain)
A-borellii
A-grandis
A-tuberculata
Anamosa
Anancosorius
Ananteris
Anaorotermes
Anapaussus
Anapidae
Anaplecta
Anaplectella
Anaplectinae
Anaplectoidea
Anapleini
Anapleus compactus
Anapleus hagai
Anapleus marginatus
Anapleus nakanei
Anapleus nomurai
Anapleus raddai
Anapsectra
Anapsida
Anaquedius
Anareolaria
Anarmodius
Anarmoxys
Anartia
A-amathea
A-chrysopelea
A-fatima
A-jatrophae
A-lytrea
Anas(Teals, Wigeons, Shovelers, Pintails, Mallard, and relatives)
A-acuta(Northern Pintail)
A-americana(American Wigeon)
A-andium(Andean Teal)
A-aucklandica(Brown Teal)
A-bahamensis(White-cheeked Pintail)
A-bernieri(Bernier's Teal)
A-capensis(Cape Teal)
A-carolinensis(Green-winged Teal)
A-castanea(Chestnut Teal)
A-clypeata(Northern Shoveler)
A-crecca(Eurasian Teal)
A-cyanoptera(Cinnamon Teal)
A-diazi(Mexican Duck)
A-discors(Blue-winged Teal)
A-eatoni(Eaton's Pintail)
A-erythrorhyncha(Red-billed Teal)
A-falcata(Falcated Duck)
A-flavirostris(Speckled Teal)
A-formosa(Baikal Teal)
A-fulvigula(Mottled Duck)
A-georgica(Yellow-billed Pintail)
A-gibberifrons(Sunda Teal)
A-gracilis(Grey Teal)
A-hottentota(Hottentot Teal)
A-laysanensis(Laysan Duck)
A-luzonica(Philippine Duck)
A-melleri(Meller's Duck)
A-penelope(Eurasian Wigeon)
A-platalea(Red Shoveler)
A-platyrhynchos(Mallard)
A-poecilorhyncha(Indian Spot-billed Duck)
A-puna(Puna Teal)
A-querquedula(Garganey)
A-rhynchotis(Australasian Shoveler)
A-rubripes(American Black Duck)
A-sibilatrix(Chiloe Wigeon)
A-smithii(Cape Shoveler)
A-sparsa(African Black Duck)
A-strepera(Gadwall)
A-superciliosa(Pacific Black Duck)
A-undulata(Yellow-billed Duck)
A-versicolor(Silver Teal)
A-wyvilliana(Hawaiian Duck)
A-zonorhyncha(Eastern Spot-billed Duck)
Anasaitis
Anasidius
Anasigerpes
A-amieti
A-bifasciata
A-centralis
A-grilloti
A-heydeni
A-nigripes
A-unifasciata
Anasopsis
Anaspida(EXTINCT) (incertae sedis)
Anaspidacea
Anastrus
A-chaqua
A-meliboea
A-neaeris
A-obliqua
A-obscurus
A-peruvianus
A-petius
A-sempiternus
A-tolimus
A-ulpianus
A-virens
Anasynodites
Anathana ellioti(Indian tree shrew)
Anatheta
Anatidae(Ducks, Geese, Swans)
Anatrytone
A-barbara
A-flavens
A-logan
A-mazai
A-mella
A-perfida
A-potosiensis
A-sarah
Anaulacaspis
Anaxarcha
A-acuta
A-graminea
A-hyalina
A-intermedia
A-limbata
A-sinensis
A-tianmushanensis
Anaxyelidae
Ancalochloris
Ancaudellia
Ancharius
Anchilophidae(EXTINCT)
Anchimolgidae
Anchineura(EXTINCT)
Anchineuridae
Anchipteraspididae(EXTINCT)
Anchitestudinella
Anchoblatta(incertae sedis)
Anchocerus
Anchomenus
A-aeneolus
A-capensis
Anchomenus clade
A-cyaneus
A-dohrnii
A-dorsalis
A-funebris
A-leucopus
A-quadratus
A-virescens
A-yukihikoi
Anchorosternum
Anchylarthron
Ancistria
AncistrocheiridaePfeffer 1912
Ancistrocladus
Ancistroides
A-armatus
A-gemmifer
A-longicornis
A-nigrita
Ancistromus
Ancistropsyllidae
Ancistrotermes
AncistroteuthisGray 1849
Anconeura(EXTINCT)
Ancoptera(EXTINCT)
Ancopteridae
Ancorabolidae
Ancyclurus
A-[n. sp.]
A-aristodorus
A-aulestes
A-colubra
A-etias
A-formosissima
A-inca
A-jurgensenii
A-meliboeus
A-melior
A-miniola
A-mira
A-paetula
A-paramba
A-rubrofilum
A-tedea
Ancylini
Ancyloxypha
A-arene
A-aurea
A-dryas
A-melanoneura
A-nitedula
A-numitor
A-ramba
Ancyridris
A-polyrhachioides
A-rupicapra
Ancyromonas(genus of heterotrophic flagellates)
A-contorta
A-melba
A-sigmoides
Ancystrocerus
Ancystroglossus
Andalgalomys
A-olrogi
A-pearsoni
A-roigi
Andamania
Andeabatis chilensis
Andegameryx(EXTINCT)
Andelis
Andinaspis(EXTINCT)
Andinentulus
Andinomys
Andinostiba
Andiotes
Andiplectops
Andogyrus
Andotypini
Andotypus
Andreaeopsida(lantern mosses)
Andrenelia pinnata(EXTINCT)
Andrenidae
Andreninae(non-monophyletic)
Andresiidae
Andrewesinulus
Andrias davidianus
Andrias japonicus
Andrias scheuchzeri(EXTINCT)0(incertae sedis)
Andrikothelyna
Andringitrana
Androctonus
Andrognathidae
Andrographideae
Andronymus
A-caesar
A-evander
A-fenestrella
A-gander
A-helles
A-hero
A-marcus
A-marina
A-neander
Andwakia
Andwakia Hozawai[sic] Uchida 1932
A-boniensisCarlgren 1943
A-insignisCarlgren 1949
A-mirabilisDanielssen 1890
A-parvaCarlgren 1940
Andwakiidae
Anebolura
A-(Anebolura)
A-(Deharvengina)
A-(Maresia)
A-(Oroussetina)
Aneides aeneus
Aneides ferreus
Aneides flavipunctatus
Aneides hardii
Aneides lugubris
Anelasmatidae
Anellovirus
Anelosimus
Anelpistus
Anemadina
Anemadini(monophyly uncertain)
Anemadiola
Anemadus
Anemarrhenaceae
Anemonactis
Anemonia
A-antilliensisPax 1924
Anemonia cinereaContarini 1844
Anemonia citrinaHadd. and Shackl. 1893
A-elegansVerrill 1901
Anemonia inequaleMc Murrich [sic] 1893
Anemonia kwoiamHaddon and Shackleton 1893
A-manjanoCarlgren 1900
A-natalensisCarlgren 1938
A-sargassiensisHargitt 1908
Anemonia stimpsoniFewkes 1889
Anennarius ocellatus Group
Anenteotermes
Anentmetus
A-pluto
A-spissicornis
Anepiini
Anepipleuronia
Anepius
Anergates atratulus
Anetia
A-briarea
A-cubana
A-jaegeri
A-pantheratus
A-thirza
Aneucamptus
Aneuretellus deformis(EXTINCT)
Aneuretinae
Aneuretus simoni
Aneurinibacillus
Aneurinita
Aneurophytales(EXTINCT)
Aneuterapus
Angaeus
Angarolarva(EXTINCT) (incertae sedis)
Angela
A-armata
A-championi
A-decolor
A-guianensis
A-inermis
A-lemoulti
A-maxima
A-minor
A-miranda
A-perpulchra
A-peruviana
A-purpurascens
A-quinquemaculata
A-saussurii
A-subhyalina
A-trifasciata
A-werneri
Angelinae
Angiosperms(flowering plants)
Angkorusa
Anguidae
Anguillidae
Anguilliformestrue eels
Anguimorpha
Angularitermes
Angulitermes
Angustonicus
Anhangatermes
Anhima cornuta(Horned Screamer)
Anhimidae(Screamers)
Anhinga anhinga(Anhinga)
Anhinga melanogaster(Oriental Darter)
Anhinga novaehollandiae(Australian Darter)
Anhinga rufa(African Darter)
Anhingidae(Anhingas)
Anhoraeomorphus
Anhydrophryne
Anicius
Anillidris bruchi
Anillina
Anillocharis
Anillochlamys
Anilloferonia(non-monophyletic)
A-lanei
A-malkini
A-rothi
A-testaceus
Anillomyrma
A-decamera
A-tridens
Animals(Metazoa)
Animantarx(EXTINCT)
Animobata
Anisacate
Anisembia
Anisembiidae
Anisentomon
Anisochoria
A-albida
A-bacchus
A-minorella
A-nadia
A-pedaliodina
A-quadrifenestrata
A-sublimbata
A-subpicta
A-superior
A-vianna
Anisodactylina
Anisodactyloids
Anisodactylus
Anisodota
Anisogamia
Anisolampra
Anisolinina
Anisolinus
Anisomys
Anisopheidole antipodum
Anisophylleaceae
Anisopodidae
Anisopsidius
Anisopsis
Anisoptera
Anisopygia
Anisoscapha
Anisostichus
Anisotarsus
Anisotoma
Anisozygoptera
Anisynta
A-cynone
A-dominula
A-monticolae
A-sphenosema
A-tillyardi
Anitra
Ankarahitra
Ankaratraella
Ankavena
Ankola
Ankylomyrma coronacantha
Ankylosauria(EXTINCT)
Ankylosauridae(EXTINCT)
Ankylosauromorpha(EXTINCT) (armored-plated dinosaurs)
Ankylosaurus(EXTINCT) (incertae sedis)
Annelida(bristleworms, ragworms, earthworms, leeches and their allies)
Annonaceae(pawpaw family)
Annulipalpia
Anobiidae(death watch beetles, spider beetles)
Anocalea
Anochetus
A-bequaerti
A-emarginatus
A-madagascarensis
A-mayri
A-neglectus
Anodonthyla
Anoeciidae(non-monophyletic) (incertae sedis)
Anogdus
Anomaloblaste
Anomalobuthus
Anomalodesmata
Anomalogramma(EXTINCT)
Anomalogrammatidae
Anomalomma
Anomalomydinae
Anomalomyrma taylori
Anomalomyrmini
Anomalophaena
Anomalopsychidae
Anomalopteryx(EXTINCT)
Anomalosa
Anomaluroidae(scaly-tailed squirrels)
Anommatochara
Anommatophilus
Anommatoxenus
Anomoclausiidae
Anomocora
Anomodontia(EXTINCT)
Anomoeotidae
Anomognathus
A-(Anomognathus)
A-(Mindoria)
Anomoplectus
Anomoporia
Anomopterellinae(EXTINCT)
Anomopus
Anomosetidae(Australian primitive ghost moths)
Anomotherium(EXTINCT) (incertae sedis)
Anomozethodes
Anomozethus
Anomura
Anonychomyrma
A-anguliceps
A-angusta
A-arcadia
A-biconvexa
A-constricta
A-dimorpha
A-fornicata
A-froggatti
A-gigantea
A-gilberti
A-glabrata
A-incisa
A-itinerans
A-longicapitata
A-longiceps
A-malandana
A-minuta
A-murina
A-myrmex
A-nitidiceps
A-polita
A-procidua
A-purpurescens
A-samlandica
A-scrutator
A-sellata
A-tigris
Anoplectus
Anoplobraxis
Anoplolepis
A-carinata
A-custodiens
A-fallax
A-gracilipes
A-nuptialis
A-opaciventris
A-rufescens
A-steingroeveri
A-tenella
Anoplosaurus(EXTINCT)0(incertae sedis)
Anoplosigerpes tessmanni
Anoplotermes
Anoplotheriidae(EXTINCT)
Anoplotherium(EXTINCT)
Anoplura
Anopsapterus
Anopsobiinae(monophyly uncertain)
Anorus
Anostomidae
Anostraca(brine shrimps, fairy shrimps)
Anoteropsis
Anotheca
Anotimus
Anotomys leander
Anotylus(incertae sedis)
Anoxybacillus
Anozethopsis
Anser(Swan Goose and relatives)
A-albifrons(Greater White-fronted Goose)
A-anser(Greylag Goose)
A-brachyrhynchus(Pink-footed Goose)
A-cygnoides(Swan Goose)
A-erythropus(Lesser White-fronted Goose)
A-fabalis(Bean Goose)
A-indicus(Bar-headed Goose)
Anseranatidae(Magpie Goose)
Anseriformes(Ducks, Geese, and relatives)
Ansibaris
Ansiea
Ansonia
Antalaha
Antanartia
A-borbonica
A-delius
A-dimorphica
A-hippomene
A-schaenia
Antarctiola
A-amaroides
A-laevigata
A-laevis
A-motschulskyi
Antarctonomus
Antarctophthirus
Antarctotachinus
Antarctothius
Antelientomon
Antemna rapax
Antennacyrtus
Antennariidae(Frogfishes)
Antennarioidei
Antennarius(monophyly uncertain)
A-analis
A-avalonis
A-bermudensis
A-biocellatus
A-coccineus
A-commersoni
A-dorhensis
A-duescus
A-hispidus
A-indicus
A-maculatus
A-multiocellatus
A-nummifer
A-nummifer Group
A-ocellatus
A-pardalis
A-pauciradiatus
A-pauciradiatus Group
A-pictus
A-pictus Group
A-radiosus
A-randalli
A-rosaceus
A-sanguineus
A-scriptissimus
A-senegalensis
A-striatus
A-striatus Group
Antennatus
Anteos
A-clorinde
A-maerula
A-menippe
Anteros
A-acheus
A-aerosus
A-allectus
A-aurigans
A-bracteata
A-carausius
A-chrysoprasta
A-cruentatus
A-formosus
A-gentilis
A-kupris
A-lectabilis
A-nubosus
A-otho
A-principalis
A-renaldus
Anthanassa
A-acesas
A-annulata
A-ardys
A-argentea
A-atronia
A-crithona
A-dracaena
A-drusilla
A-drymaea
A-frisia
A-nebulosa
A-otanes
A-ptolyca
A-sitalces
A-sosis
A-texana
Anthea couchiiCooks 1851
Anthea giganteaWeinland 1860
Antheacherida
Anthelidae(Australian lappet moths)
Anthemiphylliidae
Anthemosoma
Anthemosomatidae
Antheopsis carlgreniLager 1911
Antheopsis concinnataLager 1911
Anthericaceae
Anthessiidae
Anthicidae(ant-like flower beetles)
Anthiini
Anthobioides
Anthobiomimus
Anthobium
A-(Anthobium)
A-(Prionothorax)
Anthoboscinae
Anthoceros
Anthocerotaceae
Anthocerotophyta(hornworts)
Anthocharidini
Anthocharis
A-belia
A-bieti
A-cardamines
A-cethura
A-damone
A-gruneri
A-lanceolata
A-limonea
A-midea
A-sara
A-scolymus
A-stella
Anthocoleus habiensis(EXTINCT) (incertae sedis)
Anthocoridae(flower bugs, minute pirate bugs)
Antholoba
Antholoba epizoicaPax 1922
Anthomyiidae
Anthomyzidae
Anthonotha
Anthophagini
Anthophagus
A-(Anthophagus)
A-(Dimorphoschelus)
A-(Phaganthus)
Anthophorini(digger bees)
Anthopleura
A-Krebsi[sic] Duchassaing and Michelotti 1860
Anthopleura Stimpsoni[sic] Verrill 1868
A-anneaeCarlgren 1940
A-dowiiVerrill 1869
A-fusco-viridisnov. nom. = ! Bunodes stella Verrill, Uchida 1938
A-fuxiCarlgren 1927
A-insignisCarlgren 1940
A-japonicaVerrill 1899
A-kohliCarlgren 1930
A-mortenseniCarlgren 1941
A-pacificaUchida 1938
A-pallidaDuchassaing and Michelotti 1866
A-sanctae helenaeCarlgren 1941
A-vario-armataWatzl 1922
Anthoptini
Anthoptus
A-epictetus
A-inculta
A-insignis
A-macalpinei
A-maracanae
Anthosactis
A-capensisCarlgren 1938
A-georgianaCarlgren 1949
A-ingolfiCarlgren 1921
A-jan mayeniDanielssen 1890
Anthostella
A-Stephensoni[sic] Carlgren 1938
Anthothoe
A-australiensisCarlgren 1949
A-panamensisCarlgren 1949
Anthozoa(sea anemones, corals, sea pens)
Anthracinae
Anthracosta(EXTINCT) (incertae sedis)
Anthracotheriidae(EXTINCT)
Anthribidae(fungus weevils)
Anthroleucosomatidae
Anthropeltodonia
Anthropoides(Demoiselle Crane and Blue Crane)
A-paradiseus(Blue Crane)
A-virgo(Demoiselle Crane)
Anthuridea
Anticura
Antidorcas marsupialis(springbok)
Antifer(EXTINCT)
Antigonis
Antigonus
A-corrosus
A-decens
A-emorsa
A-erosus
A-funebris
A-liborius
A-minor
A-mutilatus
A-nearchus
Antihepialus
A-antarcticus
A-capeneri
A-keiniae
A-vansoni
Antillea
A-pelops
A-proclea
Antillesoma
Antillitermes
Antillocyathus(EXTINCT)
Antillotrecha
Antilocapra americana(pronghorn)
AA-americana
AA-mexicana
AA-peninsularis(peninsular pronghorn)
AA-sonoriensis(Sonoran pronghorn)
Antilocapridae(pronghorns and their extinct relatives)
Antilope cervicapra(blackbuck)
Antilopinae(gazelles, dik-diks, steenboks, and their relatives)
Antilospira(EXTINCT)
Antimerus
Antioquita(incertae sedis)
Antipaluria
Antiparactis
Antipatharia(incertae sedis)
Antipodebaxis
Antipodia
A-atralba
A-chaostola
Antipodoeciidae
Antirrhea
A-adoptiva
A-archaea
A-geryon
A-hela
A-ornata
A-phasiana
A-philoctetes
A-pterocopha
A-taygetina
A-undulata
A-watkinsi
Antispila
Antispilina
Antissinae
Antistia
A-maculipennis
A-parva
A-robusta
A-vicina
Antistydatusa
Antitheton
Antithetusa
Antonbruunia(incertae sedis)
Antongilus
Antoniinae
Antopedaliodes(incertae sedis)
Antrisocopia
Antrobythus
Antrocharis
Antrodiaetidae
Antrodulus
Antroherpon
Antroherponina
Antrosedes
Antrozoidae
Anuraeopsis
Anuroctonus
Anurolimnas castaneiceps(Chestnut-headed Crake)
Anurophasis monorthonyx(Snow Mountains Quail)
Anurophorinae
Anuropidae(F.)
Anyphaenidae
Anystae
Anystina
Aoa
Aoraia
A-aspina
A-aurimaculata
A-dinodes
A-flavida
A-hespera
A-insularis
A-lenis
A-macropis
A-oreobolae
A-orientalis
A-rufivena
A-senex
Aotus
Apachelytridae
Apachelytron(EXTINCT)
Apagorea
Apagotermes
Apalonia
Aparasphenodon
Aparatermes
Apataniidae
Apate
Apatelieida
Apatelodinae
Apatelomixidota
Apatetica
Apateticinae
Apatides
Apatini
Apatura
A-ambica
A-ilia
A-iris
A-laverna
A-metis
A-nycteis
Apaturina
Apaturinae
Apaturopsis
A-cleochares
A-kilusa
A-paulianii
Apaustus
A-gracilis
A-menes
A-radiatus
Apecholinus
Apexacuta
A-astoreth
A-improvisa
A-orsedice
A-superior
Aphaenogaster
A-albisetosa
Aphaenomurus
Aphaenostemmini
Aphaenostemmus
Aphanethrix
Aphanister
Aphanizomenon
Aphanocalyx
Aphantochilus
Aphantopus
Aphaobiella
Aphaobius
Aphaonus
Aphaotus
Apharina
Apharinodes
Apharitis
Apharus
Aphelandra verticillataNees
Aphelenchida
Aphelinidae
Apheliotyphlus
Aphelocheiridae
Apheloplectus
Aphelosternus(1 species)
Aphelusa
Aphididae(aphids, plantlice)
Aphidiinae
Aphidinae
Aphidini
Aphidoidea
Aphidomorpha(aphids, plant lice, adelgids, phylloxerids)
Aphidounguis
Aphilia
Aphiliops
Aphilodontidae
Aphirape
Aphlebiella
Aphloia theiformis
Aphnaeini
Aphnaeus
Apholeuonus
Aphomomyrmex afer
Aphrissa
A-boisduvalii
A-fluminensis
A-godartiana
A-neleis
A-orbis
A-schausi
A-statira
A-wallacei
Aphroditiformia
Aphroditoidea
AphrodoctopusRoper and Mangold, 1992
Aphrophoridae(froghoppers, spittlebugs)
Aphylidae
Aphyllanthaceae
Aphysoneura
A-pigmentaria
A-scapulifascia
Aphytopus
Apiaceae(umbellifers, carrot family)
Apiales
Apicomplexa
Apicotermes
Apicotermitinae
Apidae(carpenter bees, cuckoo bees, honey bees, etc.)
Apidae sensu lato(bees)
Apilitermes
Apimela
Apinae(honey bees, orchid bees, stingless bees, etc.)
Apini(honey bees)
Apioceridae(Flower-loving Flies)
Apiochaeta
Apionsoma(incertae sedis)
Apiophorinae
Apistobuthus
Aplatissa
A-michaelis
A-strangoides
Aplatodiscus
Aploa
Aplocentrus
Aploderina
Aploderus
Aplodontiidae(mountain beaver)
Aploneura
Aplopalpus
Apobatrisus
Apoboleinae
Apocatops
Apocellagria
Apocellus
Apochela
Apocliarthrus
Apocrita
Apocynaceae(milkweed family)
Apodemia
A-castanea
A-hepburni
A-hypoglauca
A-mormo
A-multiplaga
A-murphyi
A-nais
A-palmerii
A-paucipuncta
A-phyciodoides
A-walkeri
Apodemus
Apoderiger
Apoderigerina
Apodida
Apodidae(swifts)
Apodiformes(Hummingbirds and Swifts)
Apoditrysia
Apogastropoda
Apoidea
Apoleon
Apomyrma stygia
Apomys
Aponarope
Aponogetonaceae
Apopappus(EXTINCT)
Apopaussus
Apophatus
Apoplania
Apoplectus
Aporesthus
Aporhexius
Aporia
A-acraea
A-agathon
A-bieti
A-crataegi
A-delavayi
A-gigantea
A-harrietae
A-hippia
A-howarthi
A-largeteaui
A-larraldei
A-leucodice
A-monbeigi
A-nabellica
A-potanini
A-procris
Aporiina
Aposphinctus(EXTINCT) (incertae sedis)
Apostenolinus
Aposthonia(Oligotomidae) (non-monophyletic)
Apostictopterus fuliginosus
Apotectus
Apoterus
Apotomini
Apotrabisus
Apotrogia0(incertae sedis)
Apotyphlus
Apozethopsus
Apozyginae
Appaleptoneta
Apphiana
Appia appia
Appiadina
Appias (Appias)(incertae sedis)
AA-ada
AA-caeca
AA-cardena
AA-celestina
AA-hombroni
AA-indra
AA-ithome
AA-lalage
AA-leis
AA-libythea
AA-lyncida
AA-mata
AA-melania
AA-nephele
AA-nupta
AA-phoebe
AA-placidia
AA-remedios
AA-waltraudae
AA-wardi
Appias (Catophaga)
AC-[n. sp.]
AC-albina
AC-nero
AC-paulina
AC-zarinda
Appias (Glutophrissa)
Appias (Hiposcritia)(incertae sedis)
AH-lalassis
AH-pandione
AH-urania
Appias (Phrissura)
Aprosdoketusa
Aprosphylosomatidae
Apsaustodon segregatus
Apsenterotermes
Apsidocnemus
Apsidoneura(EXTINCT)
Apsidopis
Apsilocephalidae
Apsisaurus(EXTINCT)
Aptera(incertae sedis)
Apterameles rammei
Apteranillus
Apteraphaenops
Apterembia cercocyrta
Apterisca
Apternodontidae(EXTINCT)
Apteroblatta
Apterocatops
Apterocorypha
A-atra
A-aurita
A-bispina
A-somalica
Apterogyninae
Apteroloma
Apteromantis
A-aptera
A-bolivari
Apteronotidae
Apteropanorpidae
Apterostigma
A-acre
Apterouridae
Apterygidae(Kiwis)
Apteryx australis(Southern Brown Kiwi)
Apteryx haastii(Great Spotted Kiwi)
Apteryx mantelli(North Island Brown Kiwi)
Apteryx owenii(Little Spotted Kiwi)
Apteryx rowi(Okarito Kiwi)
Aptinina
Aptinoderus
Aptinomimus
Aptinomorphus
Aptinus
Apurebium
Apusomonads(several genera of heterotrophic flagellates)
Apusomonas
A-australiensis
A-proboscidea
Apygophora
Apyretina
Apyrrhothrix
Apyrrothrix araxes
Apyrrothrix arizonae
Apystomyidae
Aquabirnavirus
Aquareovirus
Aquifex
Aquificae(hyperthermophilic chemolithoautotrophs)
Aquifoliaceae(holly family)
Aquifoliales
Aquila(non-monophyletic)
Aquilex
Arabembia biarmata
Arabhydrus
Aracanidae
Arachis
Arachnida(spiders, mites, ticks, scorpions, etc.)
Arachnomura
Arachnomycetales
Aradidae(flat bugs)
Aradoidea
Araeocerus
Araeoscelidia(EXTINCT)
Araliaceae(ginseng family)
Aralidium pinnatifidum
Aralobatrachus(EXTINCT)
Aramides(Little Wood Rail and relatives)
A-axillaris(Rufous-necked Wood Rail)
A-cajanea(Grey-necked Wood Rail)
A-calopterus(Red-winged Wood Rail)
A-mangle(Little Wood Rail)
A-saracura(Slaty-breasted Wood Rail)
A-wolfi(Brown Wood Rail)
A-ypecaha(Giant Wood Rail)
Aramidopsis plateni(Snoring Rail)
Aramus guarauna(Limpkin)
Aranae
Arandaspida(EXTINCT)
Arandaspis(EXTINCT)
Araneabaxis
Araneae(spiders)
Araneidae(common orb weavers)
Araneoid sheetweb weavers
Araneoidea
Araneomorphae(most spiders: orb weavers, jumping spiders, etc.)
Aranzadiella
Ararat
Araripichthyidae(EXTINCT)
Araschnia
A-burejana
A-davidis
A-dohertyi
A-doris
A-levana
A-oreas(incertae sedis)
A-prorsoides
A-zhangi
Araucaniopsis
Araucaniotes
Araucariaceae
Araujotermes
Arawakina
Arborophila(Hill Partridge and relatives)
A-ardens(Hainan Partridge)
A-atrogularis(White-cheeked Partridge)
A-brunneopectus(Bar-backed Partridge)
A-cambodiana(Chestnut-headed Partridge)
A-campbelli(Malaysian Partridge)
A-charltonii(Scaly-breasted Partridge)
A-chloropus(Green-legged Partridge)
A-crudigularis(Taiwan Partridge)
A-davidi(Orange-necked Partridge)
A-diversa(Siamese Partridge)
A-gingica(White-necklaced Partridge)
A-hyperythra(Red-breasted Partridge)
A-javanica(Chestnut-bellied Partridge)
A-mandellii(Chestnut-breasted Partridge)
A-orientalis(Grey-breasted Partridge)
A-rolli(Roll's Partridge)
A-rubrirostris(Red-billed Partridge)
A-rufipectus(Sichuan Partridge)
A-rufogularis(Rufous-throated Partridge)
A-sumatrana(Sumatran Partridge)
A-torqueola(Hill Partridge)
Arcanobacterium
Archaea(Methanogens, Halophiles, Sulfolobus, and relatives) (non-monophyletic)
Archaeidae
Archaemegaptilus(EXTINCT) (Archaemegaptilidae)
Archaemioptera(EXTINCT)
Archaemiopteridae
Archaeoboreaphilus
Archaeoceti(EXTINCT) (non-monophyletic)
Archaeocindis johnbeckeri
Archaeocoeniina
Archaeoctonidae(EXTINCT)
Archaeofungiina(EXTINCT)
Archaeognatha(bristletails)
Archaeoindris fontoynonti(EXTINCT)
Archaeolemur edwardsi(EXTINCT)
Archaeolemur majori(EXTINCT)
Archaeolemuridae(EXTINCT) (incertae sedis)
Archaeonycteris(EXTINCT)
Archaeonympha
A-drepana
A-smalli
A-urichi
Archaeophlebia enigmatica(EXTINCT) (Paleocene, Menat, France)
Archaeopone(EXTINCT)
A-kzylzharica(EXTINCT)
A-taylori(EXTINCT)
Archaeopteridales(EXTINCT)
Archaeopteryx(EXTINCT)
Archaeorycteropus(EXTINCT)
Archaeospora
Archaeotragulus krabiensis(EXTINCT)
Archaeotriton(EXTINCT)0(incertae sedis)
Archaeozethus
Archaeprepona
A-amphimachus
A-camilla
A-chalciope
A-demophon
A-demophoon
A-licomedes
A-meander
A-phaedra
Archaestomatopodea(EXTINCT)
Archaites
Archboldomys
Archegonasteridae(EXTINCT)
Archegosauridae(EXTINCT)
Archelytridae
Archelytron(EXTINCT)
Archembia
Archeoboldoria
Archeocrypticidae
Archeoglobales
Archeorhinotermes rossi(EXTINCT)
Archeterokrohnia
A-longicaudata
A-palpifera
A-rubra
Archeuptychia
Archiacanthocephala
Archiblatta
Archiclaviger
Archiconnus
Archicupes(EXTINCT)
Archidactylinidae
Archidermaptera(EXTINCT) (non-monophyletic)
Archidermapteron(EXTINCT)
Archidiales
Archigregarinorida
Archimandrita
Archimantini
Archimantis
A-armata
A-brunneriana
A-gracilis
A-latistyla
A-monstrosa
A-quinquelobata
A-sobrina
A-straminea
A-vittata
Archimestra
Archimyrmex(EXTINCT) (incertae sedis)
A-piatnitzkyi(EXTINCT)
A-rostratus(EXTINCT)
A-smekali(EXTINCT)
Archinotodelphyidae
Archipini
Archiponera wheeleri(EXTINCT) (incertae sedis)
Archipsocidae
Architaenioglossa
ArchiteuthidaePfeffer 1900
Archizygoptera(EXTINCT)
Archoleptoneta
Archon
A-apollinaris
A-apollinus
Archonias
Archophiactinidae(EXTINCT) (incertae sedis)
Archosauria(Birds, dinosaurs, crocodiles, and their relatives)
Archosauromorpha(crocodiles, birds, and their extinct relatives)
Archostemata
Archotermopsis
Arcioneura(EXTINCT)
Arcioneuridae
Arcotermes
Arcovomer
Arctangia(EXTINCT)
Arctiidae(tiger moths)
Arctobius
Arctocebus calabarensis(golden potto, angwantibo)
Arctophysis
Arctopsychidae
Arctosa
Arctosippa
Arctosomma
Arcynopterygini
Arcynopteryx
Ardaris
Ardeidae(herons)
Ardeotis(Arabian Bustard and relatives)
A-arabs(Arabian Bustard)
A-australis(Australian Bustard)
A-kori(Kori Bustard)
A-nigriceps(Great Indian Bustard)
Ardipithecus(EXTINCT)
Ardistomopsis
A-andrewesiStraneo and Ball
A-batesiStraneo and Ball
A-marginicollis(Schaum)
A-myrmex(Andrewes)
A-ovicollis(Bates)
Arecanae
Arecinae
Aremfoxia(incertae sedis)
Arena
Arenaviridae
Arenibacter
Arenivaga
Arenophryne
Areolaria
Arethusana
A-arethusa
Areticulata
Argasidae(Soft ticks)
Argenteohyla
Argentinoidei
Argestidae
Argestina
A-inconstans
A-karta
A-pomena
A-waltoni
Argoderus
Argon
ArgonautidaeTryon, 1879
ArgonautoidaNaef, 1912
Argophyllaceae
Argopteron
A-aureipennis
A-aureum
A-puelmae
Argulidae
Argulus
Argusianus argus(Great Argus)
Argutoridius
A-chilensis
AC-ardens
AC-chilensis
AC-chubutensis
A-depressulus
Argynnina(incertae sedis)
Argynnina
A-cyrila
A-hobartia
Argynnini(Fritillaries)
Argynnis
A-adiaste
A-adippe
A-aglaja
A-alexandra
A-anadyomene
A-aphrodite
A-argyrospilata
A-atlantis
A-auresiana
A-callippe
A-carolae
A-childreni
A-clara(incertae sedis)
A-coredippe
A-coronis
A-cybele
A-diana
A-edwardsii
A-egleis
A-elisa
A-hesperis
A-hyberbius
A-hydaspe
A-idalia
A-jainadeva
A-kamala(incertae sedis)
A-laodice
A-mormonia
A-nerippe
A-niobe
A-nokomis
A-pandora
A-paphia
A-ruslana
A-sagana
A-vorax
A-xipe
A-zenobia
A-zerene
Argyrodinae
Argyrogrammana
A-alstonii
A-amalfreda
A-aparamilla
A-barine
A-bonita
A-caelestina
A-caesarion
A-celata
A-chicomendesi
A-crocea
A-denisi
A-glaucopis
A-johannismarci
A-leptographia
A-natalita
A-nurtia
A-occidentalis
A-pacsa
A-pastaza
A-physis
A-placibilis
A-praestigiosa
A-pulchra
A-rameli
A-saphirina
A-sebastiani
A-sticheli
A-stilbe
A-subimis
A-subota
A-talboti
A-trochilia
A-venilia
Argyrohyus(EXTINCT)
Argyronetidae
Argyronympha
A-gracilipes
A-pulchra
A-rubianensis
A-ugiensis
A-ulava
Argyrophenga antipodum
Argyrophorus
A-argenteus
A-n. sp. 1
A-n. sp. 2
A-n. sp. 3
Arhuaco(incertae sedis)
A-dryadina
A-ica
Arhytodini
Ariadne
A-actisanes
A-albifascia
A-ariadne
A-celebensis
A-enotrea
A-isaeus
A-merione
A-merionoides
A-pagenstecheri
A-personata
A-specularia
Arianops
Ariconias
A-albinus
A-glaphyra
Aricorina
Aricoris
A-[n. sp. 1]
A-[n. sp. 2]
A-arenarum
A-aurinia
A-campestris
A-caracensis
A-chilensis
A-cinericia
A-colchis
A-constantius
A-domina
A-epulus
A-erostratus
A-gauchoana
A-hubrichi
A-incana
A-indistincta
A-middletoni
A-montana
A-notialis
A-propitia
A-signata
A-terias
A-zachaeus
Ariekanerpeton sigalovi(EXTINCT)
Arietellidae
Ariidae
Aristiger
Aristochroa
Aristochroodes
Aristolochiaceae(dutchman's pipe family, including Lactoris fernandeziana)
Aristomorphus
Aristopus
Arita
A-arita
A-mubevensis
A-polistion
A-serra
Ariusia conspersa
Arixenina
Arkarua(EXTINCT)
Armania(EXTINCT)
A-capitata(EXTINCT)
A-curiosa(EXTINCT)
A-pristina(EXTINCT)
A-robusta(EXTINCT)
Armaniinae(EXTINCT) (non-monophyletic) (incertae sedis)
Armene
A-breviptera
A-fanica
A-griseoalata
A-hissarica
A-macroalata
A-pusilla
A-robusta
A-silvicola
Armeniola laevis
Armidale
Armitermes
Armostus
Arnetta
A-atkinsoni
A-mercara
A-verones
A-vindhiana
Arnoldiella
Arnylliini
Aroideae
Aroma
A-aroma
A-henricus
Aromobates
Arotis
A-bryna
A-derasa
A-evansi
A-kayei
A-mapirica
A-pandora
A-sirene
Arpagonus
Arpedium
Arrenuroidea
Arrhaphipterus
Arrhenes
A-dschilus
A-elena
A-germana
A-marnas
A-martha
A-tranquilla
Arrhenopeplus
Arrhenophanidae(lattice moths)
Arrhopalitidae
Arria cinctipes
Arrostoryta
Arrowina
A-anguliceps
A-nilgiriensis
A-punctatolineata
A-pygmaea
A-rostrata
A-taprobanae
Arrowinini
Arsenicicoccus
Arsenura
Arsenurinae
Artamidae(wood-swallows)
Artematopodidae
Artematopus
Artemidactis
A-victrixStephenson 1918
Artemiidae
Arteriviridae
Arteurotia tractipennis
Arthmius
Arthoniomycetes
Arthrobacter
Arthroleptella
Arthroleptidae(non-monophyletic)
Arthroleptides
Arthroleptinae
Arthroleptis
Arthromelodes
Arthromelus
A-(Arthromelus)
A-(Euthiomelus)
A-(Scaiomelus)
Arthropoda(insects, spiders, crabs, etc.)
Arthropterites klebesi(EXTINCT)
Arthropterus
Arthrospira
Arthrotardigrada
Articerodes
Articeronomus
Articeropsis
Articerus
Articulata
Artines
A-acroleuca
A-aepitus
A-aquilina
A-bipunctata
A-focus
A-fosca
A-rica
A-satyr
A-tobiasi
A-trogon
Artiodactyla(pigs, deer, cattle, goats, sheep, hippopotamuses, camels, etc.) (non-monophyletic)
Artitropa
A-alaotrana
A-boseae
A-cama
A-comus
A-erinnys
A-hollandi
A-milleri
A-reducta
Artochia
Artocoleus(EXTINCT) (incertae sedis)
Artoria
Artoriellula
Artotrogidae
Arublatta
Aruistra
Arvernineura insignis(EXTINCT) (Paleocene, Menat, France)
Arvernoceros(EXTINCT)
Arvicanthine group(African grass rice, whistling rats, rock rats, etc...)
Arvicanthis
Arvicolinae(voles, lemmings, and muskrats)
Asagarotermes
Asanis
Asanoa
Asaphida(EXTINCT)
Asaphidion
A-alaskanum
A-caraboides
A-championi
A-cuprascens
A-curtum
A-cyanicorne
A-festivum
A-flavipes
A-formosum
A-griseum
A-indicum
A-nubiferum
A-obscurum
A-ornatum
A-pallipes
A-rossii
A-substriatum
A-triste
A-viride
A-yukonense
Asaphobelis
Asarcornis scutulata(White-winged Duck)
Asbolis
Ascalaphidae
Ascaphium
Ascaphus truei
Ascaridida
Ascarina
Aschiphasmatinaesensu Günther (1953) + Dajaca
Aschiza
Ascia
Ascidicolidae
Ascioplaga
A-mimeta
A-sciasma
Ascomorpha
Ascomorphella
Ascomycota(sac fungi, yeast, Penicillium, etc.)
Ascosphearales
Ascothoracida
A-e
Ascoviridae
Ascurisoma
Ascyltus
Asellariales
Asellota
Aseminae
Asemobius
Asemoblattana
Asemonea
Aseucina
Asfarviridae
Ashtabula
A-bicristata
A-cuprea
A-dentata
A-dentichelis
A-furcillata
A-glauca
A-montana
A-sexguttata
A-zonura
Ashtenidia
Asiacoelotes
Asiadodis
A-squilla
A-yunnanensis
Asiaster(3 species)
Asiatermes(EXTINCT) (Early Cretaceous of China)
Asilidae
Asiloidea
Asimma rara(EXTINCT)
Asio(Stygian Owl and relatives)
A-abyssinicus(Abyssinian Owl)
A-capensis(Marsh Owl)
A-flammeus(Short-eared Owl)
A-madagascariensis(Madagascar Owl)
A-otus(Long-eared Owl)
A-stygius(Stygian Owl)
Asiodictya(EXTINCT) (incertae sedis)
Asiodiplatys(EXTINCT)
Askeptoxenia
Asklepia
Aslauga
A-aura
A-australis
A-bella
A-bitjensis
A-camerunica
A-ernesti
A-febe
A-guineensis
A-imitans
A-kallimoides
A-karamoja
A-katangana
A-lamborni
A-latifurca
A-marginalis
A-marshalli
A-modesta
A-orientalis
A-pandora
A-prouvosti
A-purpurascens
A-vininga
Asparagaceae
Asparagales
Aspelta
AsperoteuthisNesis, 1980
A-acanthoderma(Lu, 1977)
A-mangoldaeYoung, Vecchione and Roper, 2007
A-sp. B
Asphaeridiopus
Asphinctanilloides
A-amazona
A-anae
A-manauara
Asphinctopone
A-lamottei
A-lucida
A-silvestrii
Asphodelaceae
Aspidobactrus
Aspidochirotida(beche-de-mer, trepang, etc.)
Aspidogastrea
Aspidogastridae
Aspidoglossa
Aspidohymen(EXTINCT)
Aspidohymenidae
Aspidoneuridae
Aspidoras
A-albater
A-brunneus
A-carvalhoi
A-eurycephalus
A-fuscoguttatus
A-lakoi
A-maculosus
A-menezesi
A-pauciradiatus
A-poecilus
A-raimundi
A-rochai
A-spilotus
A-virgulatus
Aspidorhynchiformes(EXTINCT) (Mesozoic fossils) (incertae sedis)
Aspidosiphon
Aspidothoracidae
Aspidothorax(EXTINCT)
Aspiduchus
Aspidytidae
Aspitha
A-agenoria
A-aspitha
A-bassleri
A-leander
Asplanchna
Asplanchnidae
Asplanchnopus
Aspleniaceae
Aspredini
A-chthtys filamentosusValenciennes, 1840
A-chthtys tibicenValenciennes, 1840
A-chthys
Aspredinidae
Aspredo
Assa
Astacidae
Astacidea
Astacoidea
Astacus
A-astacus
A-leptodactylus
A-pachypus
Astagobius
Astalotermes
Astape denticollis
Astatinae
Astatopteryx
Astegopterx
Asteiidae
Asteliaceae
Astenina
Astenus
A-(Astenognathus)
A-(Astenopleuritus)
A-(Astenus)
A-(Eurysunius)
A-(Mecognathus)
A-(Neognathus)
Astephus(EXTINCT)
Asteraceae(composite family)
Asteractis bradleyiVerrill 1869
Asterales
Asterids
Asterocampa
A-celtis
A-clyton
A-idyja
A-leila
Asterocheridae
Asteroidea(seastars and cushion stars)
Asterolecaniidae(pit scales)
Asteroleplasma
Asterope
A-batesii
A-buckleyi
A-degandii
A-leprieuri
A-markii
A-sapphira
A-whitelyi
Asteropeia
Asterophryinae
Asterophrys
Asterosmilia
Asterozoa
Asthenesita
Asthenohymen(EXTINCT)
Asthenohymenidae
Astictopterus
A-abjecta
A-anomoeus
A-bruno
A-inornatus
A-jama
A-punctulata
A-stellata
A-tura
Astigmata
Astilbides
Astollia chloris
Astolonata
Astraeodes
Astraeoina
Astrangia
Astrapaeus
Astraptes
A-alardus
A-alector
A-anaphus
A-apastus
A-aulus
A-brevicauda
A-cassander
A-chiriquensis
A-cretatus
A-creteus
A-egregius
A-elorus
A-enotrus
A-erycina
A-fulgerator
A-fulgor
A-galesus
A-halesius
A-jaira
A-janeira
A-latimargo
A-mabillei
A-megalurus
A-naxos
A-palliolum
A-phalaecus
A-talus
A-tucuti
A-xagua
Astraspida(EXTINCT)
Astraspis desiderata(EXTINCT)
Astraspis splendens(EXTINCT)
Astratotermes
Astrhelia(EXTINCT)
Astroblepidae
Astrotischeria
Astroviridae
Asturina
Astylella
Astyloblatta
Astylosterninae
Astylosternus
Asymoplectus
A-(Asymoplectodes)
A-(Asymoplectus)
Asymphylomyrmex balticus(EXTINCT) (incertae sedis)
Atacamia
Atadenovirus
Atalopedes
A-bahiensis
A-campestris
A-carteri
A-flaveola
A-mesogramma
Atarnes
A-hierax
A-sallei
Ataxigamia
Ateleaspis(EXTINCT)
Ateles
Atelestidae
Ateloblatta
Atelopus
Atelornis
A-crossleyi(Rufous-headed Ground Roller)
A-pittoides(Pitta-like Ground Roller)
Atenisodus
Aterica
A-galene
A-rabena
Ateuchotermes
Athamas
Athelia p. p.
Atheliales
Athenaria
Athene(Little Owl and relatives)
A-brama(Spotted Owlet)
A-cunicularia(Burrowing Owl)
A-noctua(Little Owl)
Athericidae
Atheriniformes(silversides, rainbowfishes, and relatives)
Atheropterus
A-(Atheropterus)
A-(Echinotrabisus)
A-(Paratrabisus)
A-(Probatrisus)
A-(Trabisellus)
A-(Trabisidius)
A-(Trabisinus)
A-(Trabisomorphus)
A-(Trabisonoma)
A-(Trabisorites)
Atherospermataceae
Athesis
A-acrisione
A-clearista
A-vitrala
Atheta
A-(Acromyrmecoxene)
A-(Acrotonida)
A-(Alaobia)
A-(Anopleta)
A-(Arctostiba)
A-(Atheta)
A-(Attatheta)
A-(Badura)
A-(Bessobia)
A-(Ceritaxa)
A-(Chaetida)
A-(Coprothassa)
A-(Dabura)
A-(Datomicra)
A-(Delphota)
A-(Diaprepota)
A-(Dicolyota)
A-(Dilacra)
A-(Dimetrota)
A-(Donesia)
A-(Ekkliatheta)
A-(Epimella)
A-(Eubadura)
A-(Eugluta)
A-(Evaniodera)
A-(Geostibops)
A-(Hummleriella)
A-(Hygroecia)
A-(Hypsostiba)
A-(Ischnoderoecia)
A-(Lamiota)
A-(Lampratheta)
A-(Libanostiba)
A-(Metadimetrota)
A-(Microdota)
A-(Microdotina)
A-(Nemota)
A-(Niphetodroma)
A-(Oligatheta)
A-(Oreostiba)
A-(Orientatheta)
A-(Oxypodera)
A-(Paradota)
A-(Parameotica)
A-(Parametaxya)
A-(Paramidobia)
A-(Peliolurga)
A-(Pelmatheta)
A-(Phanerosphena)
A-(Philacrotona)
A-(Philhygra)
A-(Polydota)
A-(Poromicrodota)
A-(Pseudhygroecia)
A-(Pseudobessobia)
A-(Pseudohygroecia)
A-(Pseudoleptonia)
A-(Pseudopasilia)
A-(Pseudophilygra)
A-(Pseudota)
A-(Pseudothinoecia)
A-(Rhagocneme)
A-(Sepedomicra)
A-(Sipalatheta)
A-(Spelaeolla)
A-(Stictatheta)
A-(Stilbatheta)
A-(Strobilocera)
A-(Suensonia)
A-(Synaloconota)
A-(Tachynota)
A-(Thinobaena)
A-(Traumoecia)
A-(Trochanterella)
A-(Tropatheta)
A-(Umbala)
A-(Xenota)
A-(Xestota)
Athetini
Athexeniina
Atholus(~79 species)
Athomalus
Athyma
A-abiasa
A-alcamene
A-arayata
A-asura
A-bruijni
A-cama
A-cosmia
A-disjuncta
A-epithemis
A-fortuna
A-godmani
A-gutama
A-inara
A-jina
A-kanwa
A-karita
A-kasa
A-libnites
A-maenas
A-marguritha
A-mindanica
A-nefte
A-opalina
A-perius
A-pravara
A-punctata
A-ranga
A-recurva
A-reta
A-rufula
A-selenophora
A-separata
A-speciosa
A-sulpitia
A-zeroca
Athyrtis mechanitis
Atinus
AtlantaLesueur, 1817
A-californiensisSeapy and Richter, 1993
A-echinogyra
A-fragilis
A-frontieri
A-fusca
A-fusca species group
A-gaudichaudi
A-gaudichaudi species group
A-gibbosa
A-gibbosa species group
A-helicinoides
A-inclinata
A-inclinata species group
A-inflata
A-inflata species group
A-lesueuri
A-lesueuri species group
A-meteori
A-oligogyra
A-peresi
A-peroni
A-peroni species group
A-plana
A-rosea
A-selvagensisde Vera and Seapy 2006
A-tokiokai
A-turriculata
Atlantea(incertae sedis)
A-cryptadea
A-pantoni
A-perezi
A-tulita
AtlantidaeRang, 1829
Atlantisia rogersi(Inaccessible Island Rail)
Atlantitermes
Atlantopsocus
Atlantoxerus
Atomosphyrus
Atopetholidae
Atopobacter
Atopobium
Atopocentrum
Atopocnemius
Atopolinus
Atopomyrmex
A-calpocalycola
A-cryptoceroides
A-mocquerysi
Atrecus
Atribalus(1 species)
Atrichadenotecnum
Atrichornithidae(scrub-birds)
Atriplectididae
Atrochidae
Atrochus
Atropetae
Atropsocus
A-atratus
Atrytone
Atrytonopsis
A-cestus
A-deva
A-edwardsi
A-frappenda
A-hianna
A-loammi
A-lunus
A-ovinia
A-pittacus
A-python
A-vierecki
A-zweifeli
Atta
A-bisphaerica
A-capiguara
A-cephalotes
A-columbica
A-cubana
A-dissimilis
A-domicola
A-goiana
A-insularis
A-laevigata
A-mexicana
A-opaciceps
A-pilosa
A-robusta
A-saltensis
A-sexdens
A-silvae
A-tardigrada
A-texana
A-vollenweideri
Attaephilus
Attalia philbyi
Attalister
Attaneuria
Attaphila
Attapseniini
Attaxenus
Attelabidae(leaf rolling weevils, thief weevils, etc.)
Attemsiidae
Atteriini
Atticiella
Atticola
Attini(fungus-growing ants)
Attonia
Attopsis(EXTINCT) (incertae sedis)
A-longipennis(EXTINCT)
A-longipes(EXTINCT)
Attumbra
Atubaridae
Atychodea
Atympanophrys
Atypidae(purseweb spiders)
Aublysodon molnari(EXTINCT)
Aublysodontinae(EXTINCT)
Aubria
Auca
A-barrosi
A-coctei
A-nycteropus
A-pales
Auchenipteridae
Auchenorrhyncha(cicadas, spittlebugs, leafhoppers, treehoppers, planthoppers) (non-monophyletic)
Auchenotropidius
Auchenotropis
Aucuba
Audreia
Augaptilidae
Augiades
A-crinsius
A-epimethea
Augochlorini
Augustia
Auhunga
Aulacidae
Aulacigastridae
Aulacobythus
Aulacocephalonia
Aulacochthebius
Aulacocypus
Aulacopodus
Aulacopone relicta(incertae sedis)
Aulacoscelis
Aulacozethus
Aulactinia capitataVerrill 1864
Aulactinia stelloidesMc Murrich [sic] 1889
Aulacus
Aulaxus
Auliscomys
A-boliviensis
Auliscomys group
A-pictus
A-sublimis
Aulocera(incertae sedis)
Aulocyathus
Aulonia
Auloniella
Aulonogyrus
Aulonosoma
Aureliachoerus(EXTINCT)
Aureliana
A-georgianaCarlgren 1927
A-japonicaCarlgren 1940
Aurelianidae
Aureococcus
Auriculariales
Aurina dida
Austral Loxandrus(monophyly uncertain)
Australasian group(hydromyines, conilurines, and others of Australia, New Guinae, and insular SE Asia)
Australembia
Australembiidae
Australentulus
Australian series(non-monophyletic)
Australimyzidae
Australinus
Australitermes
AustraliteuthidaeLu, 2005
Australiusa
Australocamelus(EXTINCT) (incertae sedis)
Australoconota
Australocyathus
Australocyon
Australomalus
Australopauropus
Australopithecus(EXTINCT) (non-monophyletic)
Australoplatyola
Australoptochus
Australostolus
Australox Clade
Australoxenos yetmaniensis
Austrasilida
Austrelytron
Austrlobatrachus(EXTINCT)
Austrobaileya
Austrobaileyales
Austrocalea
Austrochilidae
Austrocholeva
Austrodecus
Austroesthetini
Austroesthetus
Austroeuplectus
Austroglanididae
Austrognatharia
Austrognathia
Austrogoniodidae
Austrointhus
Austrolimulus fletcheri(EXTINCT)
Austrolophrum
Austromantis albomarginata
Austromegalomus
Austronargus
Austronemadus
Austroniidae
Austropelioptera
Austroperlidae
Austrophasma caledonensis
Austrophasma gansbaaiensis
Austrophasma rawsonvillensis
Austrophasmatidae
Austropolyphaga
Austropotamobius
Austrorhexius
Austrorhysini
Austrorhysus
AustrorossiaBerry, 1918
A-antillensis
A-australis
A-bipapillata
A-enigmatica?
A-mastigophora
Austrosaginae(Flightless predatory katydids) (incertae sedis)
Austrospirachtha
Austrotachinus
Austrovates
A-papua
A-variegata
Austroypthima petersi
Autalia
Autaliini
Autochton
A-bipunctatus
A-cellus
A-cincta
A-integrifascia
A-itylus
A-longipennis
A-neis
A-pseudocellus
A-reflexus
A-siermadror
A-sulfureolus
A-vectilucis
A-zarex
Auxenocerus
Auximella
Auzakia(incertae sedis)
Avahi laniger(woolly lemur)
Avelis
Aves(birds)
Aviadenovirus
Avibirnavirus
Aviceda(incertae sedis)
Avicennia(black mangroves)
Avipoxvirus
Avitus
Avocatinus elongatus(EXTINCT)
Avocoleus(EXTINCT)
Awas
Axelinus(1 species)
Axiidae(gold moths)
Axinidium
Axinidris
A-acholli
A-bidens
A-denticulata
A-ghanensis
A-hylekoites
A-kakamegensis
A-kinoin
A-murielae
A-nigripes
A-occidentalis
A-palligastrion
A-parvus
Axiocerces
Axis(chital and relatives)
A-axis(chital)
A-calamianensis(Calamian deer)
A-kuhlii(Bawean deer)
A-porcinus(hog deer)
Axocyathus(EXTINCT)
Axodines
Axonyina
Axymyiidae
Aykhal(EXTINCT)
Aykhalidae
Aylikusa
Aythya(Scaups, Canvasback and relatives)
A-affinis(Lesser Scaup)
A-americana(Redhead)
A-australis(Hardhead)
A-baeri(Baer's Pochard)
A-collaris(Ring-necked Duck)
A-ferina(Common Pochard)
A-fuligula(Tufted Duck)
A-innotata(Madagascar Pochard)
A-marila(Greater Scaup)
A-novaeseelandiae(New Zealand Scaup)
A-nyroca(Ferruginous Duck)
A-valisineria(Canvasback)
Azaleodes
Azollaceae
Azonax
Azteca
a few hundred additional described species
aenea-group
aff. Mastotermes sarthensis(EXTINCT) (Cretaceous amber of France)
agaricoid
alpha Proteobacteria
apiscisulcata subgroup
arcesia-group
arizonensis group
attine tribe group