- Anahamulina
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- Anatoly Konstantinovich Rozhdestvensky
- Anatomically modern humans
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- Anchisaurus
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- Andinichthyidae
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- Andreolepididae
- Andreolepis hedei
- Andrew's dig
- Andrews Mountain Member
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- Andrias scheuchzeri
- Andrzej P. Karpinski
- André Hubert Dumont
- Anetoceras
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- Angelosaurus
- Angistorhinopsis
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- Angloposeidon
- Angolaichnus
- Angolasaurus
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- Anguilloides
- Anguingosaurus
- Angulomastacator
- Angusaurus
- Angustaeva
- Angustidontus
- Angustinaripterus
- Angustolenellus
- Anhanguera
- Aniksosaurus
- Animal
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- Anisian
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- Ankylosauridae
- Ankylosaurus
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- Anomotodon
- Anoploceras
- Anoplosaurus
- Anoualerpeton
- Anserimimus
- Anshunsaurus
- Antarctica
- Antarctopelta
- Antarctosaurus
- Antarctosuchus
- Antennariidae
- Anteosaurus
- Antetonitrus
- Anthoceras
- Anthracosauria
- Anthracosuchus
- Anthropoid
- Antiarchi
- Antofastaichthys
- Antorbital fenestra
- Antrodemus
- Anuitidae
- Anurognathidae
- Anurognathus
- Anzu (dinosaur)
- Aojia
- Aoniraptor
- Aorun
- Apachesaurus
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- Apateon
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- Apatopus
- Apatoraptor
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- Apatosaurus
- Aphanepygus
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- Aphelolepis
- Aphetoceras
- Aphnelepis
- Aphrosaurus
- Apidium
- Aplestosuchus
- Aplococeratidae
- Apocalymene
- Apodops
- Apogonoides
- Apomodocia
- Apomorphy
- Appalachemys
- Appalachiosaurus
- Apricosiren
- Apsopelix
- Aptian
- Aptychodon
- Aquia Formation
- Aquilolamna
- Aquitanian
- Araeoscelidia
- Araeoscelis
- Aragonictis
- Aragonite
- Aragosaurus
- Aralazhdarcho
- Aralobatrachus
- Aralosaurus
- Arambourgia
- Arambourgiania
- Arambourgisuchus
- Aramichthys
- Arandaspis
- Araripedactylus
- Araripesaurus
- Araripesuchus
- Araripichthys
- Arasella
- Araxoceras
- Araxoceratidae
- Arcadia (genus)
- Archaeagnostus
- Archaeamphora
- Archaeaspinus fedonkini
- Archaeaspis
- Archaefructus
- Archaeichnium
- Archaeoceratops
- Archaeoceratopsidae
- Archaeoceti
- Archaeocidaris
- Archaeocyatha
- Archaeodontosaurus
- Archaeoistiodactylus
- Archaeolemur
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- Archaeology
- Archaeonectes
- Archaeonectrus
- Archaeopriapulida
- Archaeopterygidae
- Archaeopterygiformes
- Archaeopteryx
- Archaeoraptor
- Archaeornithomimus
- Archaeoteleia astropulvis
- Archaeotherium
- Archaeothyris
- Archaeotriton
- Archaeovaranus
- Archaeovenator
- Archaeozeus
- Archaeus
- Archaic Homo sapiens
- Archbishop
- Archean
- Archegosauridae
- Archegosaurus
- Archelon
- Archeria
- Archichthys
- Archidermaptera
- Archimedes (bryozoan)
- Archinacelloidea
- Archoceras
- Archosauria
- Archosauriformes
- Archosauromorpha
- Archosaurus
- Arcillas de Morella Formation
- Arcobelus
- Arcovenator
- Arctaspis
- Arcticalymene rotteni
- Arcticalymene viciousi
- Arcticodactylus
- Arctocyon
- Arctolepis
- Arctosomus
- Arctostylopida
- Arcuolimbus
- Ardeosaurus
- Ardipithecus
- Arduennella
- Areia
- Areia (trilobite)
- Arenaerpeton
- Arenicolites
- Arenig
- Arenysaurus
- Areyongalepis
- Arganasaurus
- Arganodus
- Argentavis
- Argentina
- Argentinean warrah
- Argentinosaurus
- Argentoconodon
- Argentodites
- Argentopyge
- Argiles Ostréennes
- Argiles d'Octeville
- Argiles à Plicatules
- Argillichthys
- Argilloberyx
- Argochampsa
- Argunaspis
- Argyrolagus
- Argyrosaurus
- Ariekanerpeton
- Arietitidae
- Arietitinae
- Arikareean
- Aristonectes
- Aristonectidae
- Aristosuchus
- Arizona
- Arizonasaurus
- Arizonerpeton
- Arkanserpeton
- Arkarua
- Arkharavia
- Arktocara
- Arlenea
- Armadillosuchus
- Armagnostus
- Armenoceras
- Armenoceratidae
- Armillifera
- Armor (zoology)
- Arnioceras
- Arnioceratinae
- Arniotites
- Arpaditidae
- Arpagodus
- Arrhinoceratops
- Arshantan
- Arsinoitherium
- Arthricocephalites
- Arthricocephalus
- Arthrodira
- Arthropleura
- Arthropoda
- Arthurdactylus
- Articular
- Articular processes
- Artinskian
- Artioceras
- Artioceratoides
- Artoles Formation
- Artzosuchus
- Arén Formation
- Asaphestera
- Asaphiscus
- Asaphus
- Asarotus
- Ascoceratidae
- Ascocerida
- Asfaltomylos
- Ashaninkacebus
- Ashfall Fossil Beds
- Asia
- Asiaceratops
- Asiahesperornis
- Asialepidotus
- Asiamericana
- Asian Land Mammal Age
- Asiatella
- Asiatoceratodus
- Asiatosaurus
- Asiatosuchus
- Asilisaurus
- Asineops
- Askeptosaurus
- Aspidaeglina
- Aspidella
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