岐阜県一重ヶ根累層産後期シルル紀ハチノスサンゴ目床板珊瑚類

概要

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Nine tabulate coral species belonging to the order Favositida occur in the Hitoegane Formation, Gifu Prefecture. The present Late Silurian (probably late Ludlow) fauna consists of Favosites similis Sokolov, 1952a, Mesofavosites yoshikiensis sp. nov., Squameofavosites kamiyai sp. nov., Striatopora sukuna sp. nov., Hitoeganella hidensis gen. et sp. nov., Alveolites eguchii sp. nov., Alveolitella nectodigitata sp. nov., Coenites fukujiensis Niko, 2003, and Planocoenites gifuensis sp. nov. Favosites similis indicates wide distribution, whose species has previously been recorded from Ludlow strata in Baltica, Kazakhstan and South China. The thickened tabulae of Hitoeganella form a peripheral stereozone as a major constituent. The new genus is somewhat similar in a morphology of the tabulae to Kolymopora, but the latter has the corner pores. Alveolitella nectodigitata is the first representative of the genus in Japan. The type locality of C. fukujiensis by the original designation needs to reconsider. Species of Mesofavosites, Squameofavosites, Striatopora, and Alveolites are closely allied respectively to Xinjiang Uygur (Tarim), Taimyr and Altai (Siberia), the Kuznetsk Basin (Siberia), and Kawauchi (Southern Kitakami Mountains) species.
国立科学博物館の論文