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静岡大学地球科学研究報告 (1975-) >
1999 26 >

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タイトル: 白亜紀二枚貝Sphenoceramus(イノセラムス科)の殻彫刻の変異
その他のタイトル: Variation of shell sculpture in a Cretaceous bivalve Sphenoceramus(Inoceramidae)
著者: 松田, 昌之
生形, 貴男
掲載誌名: 静岡大学地球科学研究報告
出版者: 静岡大学地球科学教室
巻: 26
開始ページ: 1
終了ページ: 15
出版日付: 1999-07
NDC: 457
抄録: Variation of the external shell sculpture in three species of Late Cretaceous inoceramid bivalve Sphenoceramus [S. naumanni (YOKOYAMA), S. orientalis (SOKOLOW) and S. schmidti (MICHAEL)] from the Upper Yezo Group in northern Hokkaido were studied ontogenetically. Three growth stages β, γ, and δ, characterized by the pattern of commarginal costae, were recognized in S. naumanni and S. schmidti, while the γ-stage is absent in S. orientalis. The size of the growth stage boundaries, the onset size of the divergent ribs or commarginal undulations of the shell, and the rib density in each growth stage were analyzed in a total of 252 specimens belonging to the three species. S. orientalis is distinguished by the early appearance of commarginal undulations of the shell in the β-stage. Large size and lack of divergent ribs in the β-stage is characteristic of S. naumanni. Low rib density in the δ-stage, occasionally found in S. schmidti, helps to identify younger individuals lacking the divergent ribs.
ISSN: 03886298 OPAC
NII論文ID: 110000413386 ciniia
NII書誌ID: AN00103190 OPAC ciniib
バージョン: publisher
出現コレクション:1999 26

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