Synapsida
© 1997 Michel Laurin
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Phyllotis darwini
© Scott J. Steppan
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Galenomys garleppi
© Scott J. Steppan
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Homo sapiens
© 1993 Ethan Michelson
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Rhinopomatoidea
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Polycryptodira
© 1996 John Merck
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Phyllotis darwini
© Scott J. Steppan
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Gigantolina elongata, Chelodina longicollis
© Klaus Rohde
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Carpodacus mexicanus
© 1997 Geoff Hill
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Scelidosaurus, Thescelosaurus, Stegosaurus, Euoplocephalus
© 2001 Kenneth Carpenter
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Euneomys chinchilloides
© Scott J. Steppan
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Calomys laucha
© Scott J. Steppan
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Eligmodontia typus
© 1997 Oliver Pearson
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Calomys laucha
© Scott J. Steppan
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Chinchillula sahamae
© 1997 O. Pearson
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Gastonia
© 2000 Kenneth Carpenter
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Orycteropus afer
© 2001 California Academy of Sciences
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Calomys laucha
© Scott J. Steppan
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Hemicentetes semispinosus (Tenrecidae)
© 2000 California Academy of Sciences
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Auliscomys pictus
© Scott J. Steppan
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Gargoyleosaurus, Sauropelta, Euoplocephalus
© 2001 Kenneth Carpenter
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Homo sapiens
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Nataloidea
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Eligmodontia morgani
© Scott J. Steppan
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Reithrodon auritus
© Scott J. Steppan
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Scelidosaurus harrisoni
© 1987 Gregory Paul
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Tachyglossus aculeatus
© 1995 Greg and Marybeth Dimijian
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Daspletosaurus torosus
© 1995 Tracy Lee Ford
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Ichthyomyini
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Macroscelididae
© 1996 John Merck
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Irenomys tarsalis
© Scott J. Steppan
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Neotomys ebriosus
© Scott J. Steppan
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Phyllotis xanthopygus
© Scott J. Steppan
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Eutheria
© Nancy B. Simmons
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Diapsida
© 2000 Michel Laurin
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Reithrodon group sensu stricto
© Scott J. Steppan
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Phrynosoma
© Kevin de Queiroz
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