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Selected twenty-one species of heteromorph ammonites from the Upper Cretaceous of Hokkaido are described, in which fourteen new species and six new genera are established. Others are redescribed to im...prove the previous knowledge. For every species the stratigraphic occurrence is precisely recorded. The described species are mostly referred to the Nostoceratidae and the Diplomoceratidae. They show greater diversities in shell characters beyond the previous conceptions. Some preliminary remarks are given about the implication of the various aberrant forms. Yet we need more and better material to arrive at a satisfactory and comprehensive conclusion on the natural history of the heteromorph groups. This paper is dedicated to Mr. Tatsuo MURAMOTO who has much assisted me in providing numerous interesting specimens for study with necessary stratigraphic information.続きを見る
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Mendeley出力
23_03_p303