Classification of Hay 1916

G. †Pycnodus Agassiz 1835
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Pycnodus comminuens Hay 1916
Pycnodus planidens Hay 1916
G. Terrapene Merrem 1820 [box turtle]
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Terrapene whitneyi Hay 1916
G. †Gomphotherium Burmeister 1837
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G. †Typodus Quenstedt 1858
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Typodus valens Hay 1916
Fm. †Pycnodontidae Agassiz 1835
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G. †Pycnomicrodon Hay 1916
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Pycnomicrodon texanus Gidley 1913