Mizuhopecten kimurai ugoensis (Hatai & Nisiyama, 1939)
HATAI, K. & S. NISIYAMA. 1939. Palaeontological notes on certain Japanese scallops. Transactions and Proceedings of the Palaeontological Society of Japan, 14: 37-46 [p. 39, text-fig. p. 39]
1939 Pecten kimurai ugoensis Hatai & Nisiyama, 1939
K. Hatai S. Nisiyama, 1939,
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«By strictly adhering to the description of M. YOKOYAMA and taking only the figures which may exactly correspond to the description, it is noticed that into the Pecten kimurai-group, there are following members, namely, P. kimurai from Zyôban coal-field, P. murayamai from Akita Prefecture mentioned above, and another one wich can be named P. kimurai ugoensis n. subsp., which is figured and hitherto included into this species. P. kimurai ugoensis is from Yaawagi bed of Akita Prefecture (Ugo Province) and hitherto been included into the synonymy of P. kimurai on grounds that are now recognized to be worthy of subspecific variation, rather than mere variation. P. kimurai ugoensis has no longitudinal striae as stated to be present in the original P. kimurai, and has no strong radial ribs as stated to be present in P. murayamai, further it does not attain such a large size as those species. In the shape of the radial ribs it seems to be intermediate between P. kimurai and P. murayamai, while in surface sculpturee it leans towards the latter than to the former.»
KOTORA HATAI, & SYÔZÔ NISIYAMA, 1939
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