宮崎県祇園山層産アルベオリテス亜目床板珊瑚類

概要

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Six coral species of the suborder Alveolitina are described from the Gionyama Formation, Miyazaki Prefecture. The upper Wenlock (Lower Silurian) G2 Member occurs diverse alveolitids, including Grandalveolites saitoi sp. nov., Subalveolites ordinarius Kim, 1971, Kitakamiia hamadai sp. nov., and Gionyamapora kambei gen. et sp. nov. Coenites sp. indet. and Planocoenites oishinouchiensis sp. nov. of coenitids are constituents of an assemblage in the lower Ludlow (Upper Silurian) G3 Member. The new genus Gionyamapora is proposed for a caliaporine and differs from Subcaliapora mainly in having the thick tabular coralla with the proximal prostrate corallites. Subalveolites ordinarius is common in the Wenlock of Uzbekistan, Central Asia. Closely related forms with the Gionyama alveolitine fauna were also known from the Kawauchi Formation, Iwate Prefecture and Hitoegane Formation, Gifu Prefecture in Japan, and from the Siberian Platform. On the basis of the intercorallite wall structure, a possibility of polygenesis in Alveolitina is suggested.
国立科学博物館の論文