直方市産の漸新世大型アミノドン類と嘉麻市産の始新世サイ上科奇蹄類

抄録

A fossil of large canine tooth has been discovered from the Ideyama Formation, Otsuji Group, at road cut in Tonno district, Nogata City, Kyushu. The double cutting edges on the distal face of canine and other features indicate that the fossil belongs to large amynodontids. In Japan, Zaisanamynodon borisovi was reported from the Middle to Upper Eocene bed in Hyogo Prefecture. Adding to that, several amynodontid fossils have been reported from the Eocene to Oligocene beds in Hokkaido, Yamaguchi and Saga Prefectures. These occurrences show wide distribution and longtime range of amynodontids in Japan. There is another fossil tooth of a rhinocerotoid from the Nogata Group, at Inazuki, Kama City. The tooth has already been reported without description. In this report, the tooth is also described for the future research.