990 Inoceramus (Platyceramus) szaszi sp. nov. (Bivalvia) from the Coniacian (Cretaceous) of Hokkaido
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概要
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Inoceramus (Platyceramus) szaszi sp. nov. is established on a sample and supplementary specimens from the upper Middle Coniacian of the Ikushunbetsu valley, central Hokkaido. It resembles I. (Pl.) mantelli de Mercey, 1877 and also I. (Pl.) troegeri Noda, 1992, but is distinct from them in its fan-shaped outline, fairly constant obliquity and inconspicuous ornamentation. Statistical analyses of some selected characters also reveal significant morphological differences. On the ground of stratigraphic position and morphological resemblance, I. (Pl.) szaszi is presumed to descend from I. (Pl.) troegeri of the Lower to lower Middle Coniacian, but it is probably an offshoot without giving rise to any descendant.
- 日本古生物学会の論文
- 1995-06-30
日本古生物学会 | 論文
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