Aulophyseter mediatlanticus

Aulophyseter mediatlanticus is an extinct sperm whale of the family Physeteridae, named by Cope in 1895 and placed in the genus Aulophyseter. The Paleobiology Database records it as an extinct marine animal. The genus Aulophyseter lived during the Miocene, and its fossils have been found in the Oidawara Formation of Japan and in the Temblor Formation of California and the St. Marys Formation of Maryland in the United States. The genus is estimated to have been about 6.4 metres long and to have weighed roughly 1,100 kilograms. Its small teeth lack enamel, which suggests that its feeding habits resembled those of the modern sperm whale more than those of other early sperm whales, with a diet largely limited to cephalopods and fish.