This category contains all fictional species included within the phylum Chordata. At one point in their development, chordates have a notochord, a dorsal nerve cord, pharyngeal slits, and a post-anal tail. The three living chordate subphyla are the lancelets (cephalochordates), sea squirts (urochordates) and vertebrates.
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A
- A-Human
- Aard-ephru
- Aardcroc
- Aardvark person
- Abomibumble
- Accordianteater
- Achernonian
- Acid Lizard
- Aciedactylus mandocaris
- Acorril
- Acroankylosaurus
- Acrocanthops
- Acrocanthosaurus striata
- Adlapsusaurus craninsulamus
- Aerodactyl
- Aerosaur
- Afanc
- African bristlehorn
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- African megahorn
- African toothpick
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- Agropelter
- Ahuizotl
- Aigamuxa
- Aigner-Clark’s day gecko
- Air Cheep
- Akrennian
- Al Packa
- Alangasaurus
- Alankylosaurus
- Alaskan Shuttlecock
- Alastor's deer (SWRC)
- Alayssian Ape
- Alayssian Komodo
- Alayssian Moa
- Alayssian Sea Lion
- Alayssiohippus
- Albatoss
- Albertospinos
- Albino Penguin (Cthulhu Mythos)
- Albino screaming gorilla
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- Alfred's Hitchcock
- Alicorn
- Alien (The Sims)
- Alien Bigfoot
- Alien Goat
- Alien Grunt
- Alligator-headed fairy
- Allodaposuchus exterminator
- Allonogmius
- Alloraptor
- Allosaurus therotribus
- Allosinosaurus
- Alolan Ninetales
- Alolan Raichu
- Alolan Raticate
- Alomomola
- Alpacataur
- Alpine hona
- Amargocephalus
- Amargospinus
- Amazon
- Amazonian
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- American grasbuck
- American woolly therizinosaur
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- Amphithere
- Amulocetus amphibius
- Ancalagon the Black
- Ancestor of all Warm-Blooded Animals
- Anchorwhip
- Ancient parrothawk
- Andean upclaw
- Andrewtodon
- Andromedan
- Angry Sun
- Anguirus
- Anklebiter
- Ankloranodon
- Ankura gungan
- Ankylocodon
- Ankylodicurus
- Ankylodocus
- Ankylosaurus armatus
- Ankylosaurus crassacutis
- Ankylosaurus sornaensis
- Ankylosaurus spicea
- Ankyntrosaurus
- Antarctovenator
- Anti-Fairy
- Anti-Fairy Dog
- Antman
- Antorian Pebblet
- Anvilbeak
- Anxious Dog
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- Apatosaurus gigas
- Apatosaurus ingens
- Apeis stupidius
- Aquamorph
- Aquatic
- Aquatic Ape
- Aquatitan
- Aquilamimus
- Arbok
- Arbourarmour
- Archaeophicyon
- Archaeopteryx magnamilvum
- Arctic camel
- Arctic Peeper
- Arctic Rabbuck
- Arctotitan
- Arcturian
- Ardentismaxima
- Ardontosaurus
- Argentinian bullid
- Argentinosaurus macrorhynchos
- Argonian
- Arian
- Armadillo lion
- Armatell
- Armiger rex
- Armormata
- Arquillian
- Arrowtongue
- Articuno
- Asgard
- Asgardian wolf
- Asogian
- Asperdorsus bellator
- Asura
- Asuryani
- Atacama cazarrio
- Atlantean (DC)
- Atlantean (Marvel)
- Atlantic bay-gull
- Atlantic Sea King
- Atmospheric Salp
- Atrociraptor horridus
- Atrociraptor ignis
- Attack Frog
- Austroposeidon dryas
- Avarusaurus
- Axehandle Hound
- Ayuwoki
- Azurite
B
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- Babookari
- Baboon hawk
- Bad Rat
- Badgermole
- Badgerpus
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- Bait Robber
- Bajatonodon
- Baku
- Baku (Spec Dinosauria)
- Balaclav
- Balan's species
- Ball-headded puppet
- Ball-tailed cat
- Balloon Maker Dantini
- Balundaur
- Banana Bird
- Banana Fairy
- Bananaman
- Banded Bumblet
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- Bandersnatch grassbag
- Bandipus
- Banshee (Mythology)
- Banshee (Spiderwick Chronicles)
- Banshees (Avatar)
- Barbaridactylus magnificens
- Barbegazi
- Bardelot
- Barlgura
- Barnett's zallingersaur
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- Bartzillasaurus braticus
- Baryonyx aquafulgur
- Bas
- Basilosaurus solatiumfecit
- Bastiodon
- Battletoad
- Batweasel
- Bavarionyx
- Bean
- Bear Owl
- Bear Pear
- Beast (Days of Monsters)
- Beast of Bray Road
- Beast of Busco
- Beastman (Warhammer)