Classification of Stevens 1977

G. Heloderma Wiegmann 1829 [beaded lizard]
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†Heloderma texana Stevens 1977
G. †Brachyerix Matthew 1933
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†Brachyerix hibbardi Stevens 1977
G. †Gregorymys Wood 1936
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†Gregorymys riograndensis Stevens 1977
G. †Phenacocoelus Peterson 1907
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†Phenacocoelus leptoscelos Stevens et al. 1969
G. †Michenia Frick and Taylor 1971
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†Michenia australis Stevens 1977
†Merychyus calaminthus Jahns 1940
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Invalid names: Merychyus crabilli Schultz and Falkenbach 1947 [synonym]
Subfm. †Sciurinae Gray 1821
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G. †Similisciurus Stevens 1977
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†Similisciurus maxwelli Stevens 1977
Subfm. †Floridatragulinae Maglio 1966
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G. †Aguascalientia Stevens 1977
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†Aguascalientia wilsoni Dalquest and Mooser 1974
Subfm. †Aepycamelinae Webb 1965
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G. †Priscocamelus Stevens et al. 1969
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†Priscocamelus wilsoni Stevens et al. 1969