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This paper contains primarily the systematic descriptions of twenty-one species of the Acanthoceratidae from Hokkaido as all addition to the previously published monographs. Eight new species are esta...blished and two new genera are proposed. Others are identified with or closely allied to already known species, which are revised on this occasion. Broadly speaking, the succession of acanthoceratids in the Cenomanian sequence of Hokkaido shows fairly good agreement with that of western Europe, if minor local differences are ignored. Numerous multituberculate species belonging to several genera occur in the Turonian, showing a considerable diversity.show more
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