岐阜県一重ヶ根層産後期シルル紀オーロポーラ目床板珊瑚類

概要

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Two new species of auloporid tabulate corals, Aulocystis hitoeganensis and Syringoporella yamakoshii, are described from the Late Silurian of the Hitoegane Formation, Gifu prefecture. Aulocystis hitoeganensis closely resembles a Ludlow species A. okitsui from the Suberidani Group, Tokushima Prefecture and Gionyama Formation, Miyazaki Prefecture. The discrimination of these species is based on the smaller corallite diameters, the shorter free portion of the corallites, and the fewer tabulae of Aulocystis hitoeganensis. Furthermore, this new Aulocystis species probably absents in septal spine. The most similar species with Syringoporella yamakoshii was reported from Guizhou, South China as S. paramoravica, but differs in its less irregular corallite distribution. Syringoporella was not previously known in Japan. The age of Hitoegane coral fauna is Ludlow (to Pridoli?)
国立科学博物館の論文