岐阜県可児市の前期中新統より新たに発見された Youngofiber(哺乳綱・ビーバー科)

概要

論文の詳細を見る
An isolated cheek tooth of a large-sized rodent was collected in 1987 from the late Early Miocene Nakamura Formation, Kani City, central Japan. It has been described (along with other fossils), but direct comparisons with various Chinese and North American castorid specimens led to a revised identification. Its size, enamel pattern of occlusal surface, brachydonty, presence of an apression facet on the posterior surface of the tooth, and root pattern suggest that the tooth is left P^4 of Youngofiber sinensis, originally known from Xiacaowan, Jiangsu, China. This is a new record of Y. sinensis from central Japan and strengthens the closer relationship in paleogeography between Japan and Southern China during the Early Miocene.
1995-12-22