987 Redescription of Asano and Nakamura's (1937) cassidulinid species based on their primary types

概要

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Asano and Nakamura (1937) described 14 cassidulinid species and subspecies found in Pliocene to Recent marine sediments of Japan. They stored these type specimens in the collection of Tohoku University. However, Asano and his colleague's collection including the cassidulinid types has not been well organized, as reported by Hasegawa (1986). During his investigation of the foraminiferal collection, Hasegawa found the holotype, paratype and hypotype specimens of the-species published in 1937. Since these specimens have not been available for later systematic works such as Nomura (1983a, b), herein we redescribe Asano and Nakamura's holotype and hypotype specimens in order to supplement Nomura's work, and revise taxonomically these species according to the modern foraminiferal systematics. Reexamination reveals that Cassidulina subglobosa parva is a synonym of Cassidulina decorata Sidebottom. Globocassidulina parva as described by Nomura (1983b) is in part synonymous with Globocassidulina canalisuturata Eade (1967) from Recent sediments off New Zealand.
日本古生物学会の論文
1995-06-30