Classification of Walcott 1900
Cl. Mammalia Linnaeus 1758 [mammal]
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G. †Triceratops Marsh 1889
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†Triceratops californis Marsh 1898
†Triceratops obtusa Marsh 1898
†Triceratops sulcatus Marsh 1890
G. †Ceratops Marsh 1888
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†Ceratops alticornis Marsh 1887
†Ceratops montanus Marsh 1888
Subcl. Dinosauria Owen 1842 [dinosaur]
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