Claim: Cranioceras(Matthew, 1918) is an extinct genus of  even-toed ungulates of the Palaeomerycidae family from the class Mammalia from the Miocene to the Pliocene in the United States.
Evidence: Cranioceras is an extinct genus of artiodactyl from the Miocene to the Pliocene in the United States. The even-toed ungulates (Artiodactyla /ˌɑːrtioʊˈdæktɪlə/, from Ancient Greek ἄρτιος, ártios 'even', and δάκτυλος, dáktylos 'finger / toe') are ungulates—hoofed animals—which bear weight equally on two (an even number) of their five toes: the third and fourth. Genus: †Cranioceras
Matthew, 1918 Family: †Palaeomerycidae Class: Mammalia