Taxonomy and distribution of Plio-Pleistocene Buccinum(Gastropoda: Buccinidae) in northeast Japan.

概要

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Twelve species of Buccinum are recorded from the Plio-Pleistocene of northeast Japan. Two new species, Buccinum shibatense and B. saitoi, are proposed, and a total of six distributional types (Types A-FJ) are recognized among the 12 species. Three extinct species comprise the type FJ, which is endemic to the Japan Sea borderland. Type A is for species that are extinct in the Japan Sea, but are still living in the Sea of Okhotsk and Bering Sea. Type B species are known as fossils only along the Japan Sea margin, and now live in the northern Japan Sea as well as in the Northwest Pacific and the Sea of Okhotsk. Type C species have been recorded as fossils from the Pacific and the Japan Sea coasts and still live in both coasts. Type D species live only on the Pacific side, and are recorded as fossils only from there. Type E species occur as fossil and living specimens only in the Japan Sea. Species in both types A and FJ species underwent extinction owing to anoxic conditions during Pleistocene glacial episodes along the Japan Sea borderland. The type E species survived in the lower sublittoral to upper bathyal waters of the Japan Sea which had normal salinity and were oxic.
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