西南日本淡路島の上部白亜系から発見された プレシオサウルス上科 (爬虫綱, 鰭竜亜綱, 長頸竜目) 化石

抄録

Many fossils of marine reptiles have recently been found in the Upper Cretaceous system of the Japanese Islands. An isolated tooth was found in the Lower Maastrichtian section of the Izumi Group in Awaji island, Southwestern Japan. The tooth shows characteristics of Plesiosauroidea. This is the first Plesiosauroid from the Izumi Group, and this paper contains the first description of Plesiosauroidea from the Maastrichtian section of the Japanese Islands.