光学顕微鏡による二枚貝多歯類の〓歯構造の研究 : 二枚貝〓歯部の硬組織の比較形態学的研究による多歯類の系統関係についての一考察

概要

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A lot of new facts on the various parts of the tooth area in Arcacean species have been made clear by the microscopic observation. The structure of the tooth varies with the genus as Anadara, Arca and Barbatia or, in other cases, with the subfamily as Glycymeridae, Limopsidae and Cucullaeidae. The structure of the striation on the side wall of tooth is common to all species of Arcacea, and is different from the tooth structure. Hinge plate of every species has the same structure to the crossed lamellar one, as the outer shell layer. As to the development of the hinge plate under the tooth, each species shows variant features. The most primitive type is Cucullaeidae, on the other hand the most developed one is in Glycymeridae and the rest are intermediate of the two. An assumption on the phylogenetic relations between Taxodont species is proposed in this paper by the writer, from the discussion of all characteristic features as to the tooth area and some others ; the structure, the degrees of the development of tooth and hinge plate, and the geological range of these species.
地学団体研究会の論文
1970-07-25