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This is a serial comprehensive study on the Lower Cretaceous pelecypods of Japan, except for the trigoniids, the pachyodonts and the brackish- and fresh-water species. In the present part 19species be...longing to the Asthenodontida and the Eudesmodontida are described systematically on the basis of many specimens which were collected from various sedimentary areas by stratigraphers and palaeontologists including myself. 4new species are proposed. As the result of this study it is recognized that the Aritan (≒upper Neocomian) and the Miyakoan (except for the uppermost part) (≒Aptian-Albian) pelecypods are represented by about 50 and about 130species respectively. Their stratigraphic occurrence are noted, and their faunal significance is discussed in some detail. The pelecypods of the two epochs are more or less clearly distinguishable from the Berriasian and earlier ones represented in Japan by the "Torinosu-type" fauna and also from the post-Albian ones which are well known in the uppermost Miyakoan and Gyliakian of Hokkaido and Kyushu. The faunal resemblance between the Japanese Aptian and the Lower Greensand of England is especially worthy of note.show more
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4.Systematic descriptions (continued from Part Ⅱ) 5.Stratigraphic occurrences of Lower Cretaceous marine pelecypods in Japan 6.Some remarks on the faunal characters 7.Locality guide
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