900. NOTES ON A CRETACEOUS BIVALVE INOCERAMUS (PLATYCERAMUS) MANTELLI DE MERCEY FROM JAPAN

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  • 900. 日本産白亜紀 Inoceramus (Platyceramus) mantelli de Mercey について
  • 日本産白亜紀Inoceramus(Platyceramus)mantelli de Merceyについて(英文)
  • ニホンサン ハクアキ Inoceramus Platyceramus mant

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Based on a number of specimens of Inoceramus (Platyceramus) mantelli de Mercey, 1877, from Hokkaido several quantitative characters were examined biometrically. The specimens of I.(P.) mantelli from Japan have been hitherto ascribed to I.(P.) yubariensis Nagao et Matsumoto, 1940. From the precise comparison between the specimens from Europe and Japan, the morphological difference is so slight that specific distinction does not seem necessary. Thus the specific name I.(P.) yubariensis Nagao et Matsumoto falls in a junior synonym of I.(P.) mantelli de Mercey. Stratigraphically I.(P.) mantelli from Europe and eastern contiguous regions ranges throughout the Coniacian, whereas the range of this species in Japan is from the Upper Coniacian to the Santonian. The ancestry of I.(P.) mantelli is as yet uncertain, but this species may be the common ancestor of various species of Inoceramus (Platyceramus) from the Santonian and Campanian.

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