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- Acara spec.
- Acara subocularis
- Acarichthys
- Acarichthys heckelii
- Acaronia
- Acaronia longirostrum
- Acaronia nassa
- Acaronia vultuosa
- Acentrogobius
- Acentrogobius audax
- Acentrogobius caninus
- Acentrogobius cyanosmos
- Acentrogobius cylindriceps
- Acentrogobius janthinopterus
- Acentrogobius moloanus
- Acentrogobius multifasciatus
- Acentrogobius pflaumii
- Acentrogobius quinquemaculatus
- Acentrogobius simplex
- Acentrogobius spec.
- Acentrogobius suluensis
- Acentrogobius therezieni
- Acentrogobius viganensis
- Acentrogobius viridipunctatus
- Acentronichtys leptos
- Acentronura brevipercula
- Acentronura tentaculata
- Acentrophryne longidens
- Aceraspis robustus
- Aceroichthys
- Aceroichthys dioctes
- Acestridium colombiensis
- Acestridium dichromum
- Acestridium discus
- Acestridium gymnogaster
- Acestridium martini
- Acestridium scutatum
- Acestridium spec."Rio Cristalino"
- Acestridium triplax
- Acestrocephalus acutus
- Acestrocephalus boehlkei
- Acestrocephalus maculosus
- Acestrocephalus nigrifasciatus
- Acestrocephalus pallidus
- Acestrocephalus sardina
- Acestrocephalus stigmatus
- Acestrorhamphus hepsetus
- Acestrorhamphus macrolepis
- Acestrorhynchidae
- Acestrorhynchinae
- Acestrorhynchus
- Acestrorhynchus abbreviatus
- Acestrorhynchus altus
- Acestrorhynchus britzkii
- Acestrorhynchus falcatus
- Acestrorhynchus falcirostris
- Acestrorhynchus grandoculis
- Acestrorhynchus heterolepis
- Acestrorhynchus isalineae
- Acestrorhynchus lacustris
- Acestrorhynchus maculipinna
- Acestrorhynchus microlepis
- Acestrorhynchus minimus
- Acestrorhynchus nasutus
- Acestrorhynchus pantaneiro
- Acestrorhynchus sp. "Bolivien"
- Acestrorhynchus sp. "Rio Negro"
- Achal Singh
- Achamveettil Gopalakrishnan
- Acheilognathidae
- Acheilognathus
- Acheilognathus barbatulus
- Acheilognathus chankaensis
- Acheilognathus cyanostigma
- Acheilognathus cyanostigma (Art)
- Acheilognathus deignani
- Acheilognathus deignani (Art)
- Acheilognathus elongatoides
- Acheilognathus elongatus brevicaudatus
- Acheilognathus elongatus elongatus
- Acheilognathus elongatus microphysa
- Acheilognathus kyphus
- Acheilognathus lamus
- Acheilognathus lanceolata
- Acheilognathus limbata
- Acheilognathus longibarbatus
- Acheilognathus longipinnis
- Acheilognathus macromandibularis
- Acheilognathus macropterus
- Acheilognathus majusculus
- Acheilognathus mengyangensis
- Acheilognathus meridianus
- Acheilognathus polyspinus
- Acheilognathus rhombea
- Acheilognathus rhombeus
- Acheilognathus signifer
- Acheilognathus striatus
- Acheilognathus tabira erythropterus
- Acheilognathus tabira jordani
- Acheilognathus tabira nakamurae
- Acheilognathus tabira tabira
- Acheilognathus tabira tohokuensis
- Acheilognathus tonkinensis
- Achille Valenciennes
- Achille de Zigno
- Achilles Andreae
- Achim Brühlmeyer
- Achim R. Boguth
- Achim Werckenthin
- Achiridae
- Achiroides
- Achiroides leucorhynchos
- Achirophichthys kampeni
- Achiropsetta tricholepis
- Achiropsettidae
- Achirus
- Achirus abnormis
- Achirus achirus
- Achirus affinis
- Achirus lineatus
- Achirus mazatlanus
- Achirus mucuri
- Achirus spec."Rio Sipapo"
- Achom Darshan
- Achondrostoma
- Achondrostoma arcasii
- Achondrostoma asturicense
- Achondrostoma garzonorum
- Achondrostoma numantinum
- Achondrostoma occidentale
- Achondrostoma oligolepis
- Achondrostoma salmantinum
- Acinocheirodon
- Acinocheirodon melanogramma
- Acipenser
- Acipenser baeri
- Acipenser baeri baicalensis
- Acipenser brevirostrum
- Acipenser dabryanus
- Acipenser fulvescens
- Acipenser gueldenstaedti
- Acipenser gueldenstaedti colchius
- Acipenser gueldenstaedti persicus
- Acipenser gueldenstaedtii
- Acipenser medirostris
- Acipenser milberti
- Acipenser mitchillii
- Acipenser naccarii
- Acipenser nudiventris
- Acipenser oxyrinchus desotoi
- Acipenser oxyrinchus oxyrinchus
- Acipenser persicus
- Acipenser persicus colchicus
- Acipenser rostratus
- Acipenser ruthenus
- Acipenser schrenckii
- Acipenser schypa
- Acipenser sinensis
- Acipenser stellatus
- Acipenser sturio
- Acipenser transmontanus
- Acipenseridae
- Acipenseriformes
- Acipenserinae
- Acipenseroidei
- Acnodon normani
- Acnodon oligacanthus
- Acnodon senai
- Acommissura
- Acoremaspis pholidata
- Acregoliath rancii
- Acreichthys tomentosus
- Acrobrycon
- Acrobrycon ipanquianus
- Acrobrycon tarijae
- Acrochordonichthys buettikoferi
- Acrochordonichthys chamaeleon
- Acrochordonichthys gyrinus
- Acrochordonichthys ischnosoma
- Acrochordonichthys melanogaster
- Acrochordonichthys obscurus
- Acrochordonichthys pachyderma
- Acrochordonichthys pleurostigma
- Acrochordonichthys rugosus
- Acrochordonichthys septentrionalis
- Acrochordonichthys varius
- Acrolebias
- Acrolebias carvalhoi
- Acromycter
- Acromycter longipectoralis
- Acromycter nezumi
- Acropoma
- Acropoma arafurensis
- Acropoma argentistigma
- Acropoma boholensis
- Acropoma heemstrai
- Acropoma japonicum
- Acropoma lacrima
- Acropoma lecorneti
- Acropoma leobergi
- Acropoma musorstom
- Acropoma neglectum
- Acropoma splendens
- Acropomatidae
- Acropomatiformes
- Acrossocheilinae
- Acrossocheilini
- Acrossocheilus
- Acrossocheilus bantamensis
- Acrossocheilus carongensis
- Acrossocheilus clivosius
- Acrossocheilus deauratus
- Acrossocheilus fasciatus
- Acrossocheilus furongjiangensis
- Acrossocheilus hemispinus
- Acrossocheilus hexagonolepis
- Acrossocheilus iridescens
- Acrossocheilus iridescens microstoma
- Acrossocheilus iridescens yuanjiangensis
- Acrossocheilus kreyenbergii
- Acrossocheilus lamus
- Acrossocheilus malacopterus
- Acrossocheilus malcolmi
- Acrossocheilus paradoxus
- Acrossocheilus schroederi
- Acrossocheilus smedleyi
- Acrossocheilus spinifer
- Acrossocheilus tweediei
- Acrossocheilus wenchowensis
- Acrossocheilus xamensis
- Acrossocheilus yeni
- Acrossocheilus yunnanensis
- Acroteriobatus
- Acroteriobatus andysabini
- Acroteriobatus annulatus
- Acroteriobatus blochii
- Acroteriobatus leucospilus
- Acroteriobatus omanensis
- Acroteriobatus salalah
- Acroteriobatus stehmanni
- Actinopteri
- Actinopterygii
- Aculeola nigra
- Acyrtus
- Acyrtus arturo
- Acyrtus pauciradiatus
- Acyrtus simon
- Acácio F. Nogueira
- Adachi
- Adalbert Liebus
- Adalberto Luis Val
- Adalto Bianchini
- Adam
- Adam Ben-Tuvia
- Adam E. Cohen
- Adam G. Jones
- Adam L. Bazinet
- Adam M. M. Stuckert
- Adam Nadachowski
- Adam P. Summers
- Adam R. Smith
- Adam Rick Bessa-Silva
- Adamans
- Adamas
- Adams
- Adan Fernando Mar-Silva
- Adauto Lima Cardoso
- Adela Roa-Varon
- Adeleh Heidari
- Adeline Collet
- Adelino V. M. Canário
- Adelinyr Azevedo de Moura Cordeiro
- Adeljean L. F. C. Ho
- Adelosebastes
- Adelosebastes latens
- Adelotremus
- Adelotremus deloachi
- Adelotremus leptus
- Adem Hamzić
- Adem de Broel Platera
- Adi Vesnić
- Adib Saad
- Adilia Nogueira
- Adinia multifasciata
- Adinia xenica
- Adiniops
- Adipocottus
- Adipocottus multiradiatus
- Adipocottus nikolskii
- Adipocottus talievi
- Aditya Hutama
- Aditya Srinivasulu
- Adler
- Adna Almeida de Albuquerque
- Adolf Bernhard Meyer
- Adolf Horn
- Adolf Kellermann
- Adolf Kotthaus
- Adolf Zänkert
- Adolf von Klein
- Adolf von Koenen
- Adolfo González
- Adolfo Navarrete
- Adolfo de Sostoa
- Adolph Christian Siemssen
- Adolph Erman
- Adolphus Guilielmus Otto
- Adonaji Madeleine Orozco-Ruíz
- Adonia
- Adontosternarchus balaenops
- Adontosternarchus clarkae
- Adontosternarchus devenanzii
- Adontosternarchus nebulosus
- Adontosternarchus sachsi
- Adrian C. Pinder
- Adrian Calleros
- Adrian DeLeon
- Adrian G. Glover
- Adrian Indermaur
- Adrian J. Flynn
- Adrian Philip Andrews
- Adrian R. Tappin
- Adrian W. Taylor
- Adriana Almirón
- Adriana C. Braga
- Adriana E. Aquino
- Adriana Ferreira Lima
- Adriana García-Alarcón
- Adriana Guzmán
- Adriana J. Meschiatti
- Adriana López-Arbarello
- Adriana M. Suárez Q.
- Adriana Mancuso
- Adriana Martínez‐Guevara
- Adriana Max-Aguilar
- Adriana Vella
- Adrianichthyidae
- Adrianichthyinae
- Adrianichthys
- Adrianichthys kruyti
- Adrianichthys oophorus
- Adrianichthys poptae
- Adrianichthys roseni
- Adrianna M. Powers
- Adrianus F. Konings