北上山地中里層の中期テボン紀腹足類

概要

論文の詳細を見る
The Nakazato Formation, the only fossiliferous Middle Devonian unit known in Japan, yields diverse shallow marine invertebrate fossils. Eight gastropod species from a thin fine-grained sandstone bed at one locality, represent the first Middle Devonian gastropods recorded from Japan. One new genus, Fujispira, probably of the Omphalotrochidae, five new species, Tropidodiscus (Tropidodiscus) nakazatensis, Orecopia kobayashii, Fujispira japonica, Ulrichospira kanekoi and Euryzone onoi, and three unnamed species, Bellerophon (Bellerophon) sp., Retispira sp. and Murchisonia (Murchisonia) sp., are discribed in this report. Although faunal affinity of the Nakazato biota is still poorly known, this gastropod faunule provides additional information for understanding the Middle Devonian biota of Japan.
国立科学博物館の論文
1986-09-22