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Paleobiology of heterodont bivalves based on polymorphism of the hinge-teeth

基于铰齿多态性的异齿双壳类古生物学

基本信息

批准号：
07640624
负责人：
MATSUKUMA Akihiko
金额：
$ 1.47万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

A study of hinge transposition in the heterodont bivalve families Carditidae, Condylocardiidae, Crassatellidae, Astartidate, Trapezidae, Cardiidae, Tellinidae, and Veneridae, showed that all these families except Condylocardiidae, Cardiidae, Tellinidae, and Veneridae rarely have transposed hinges, mainly less than 1.0%.Any valve with transposed anterior lateral teeth had transposed cardinal teeth on the same valve, and any valve with normal anterior lateral teeth always had normal cardinal teeth. The anterior lateral teeth and the cardinal teeth may be a single genetically linked single unit in these families, and the posterior lateral teeth another unit. Each unit is represented by two phenotypes, namely normal and transposed dentition. With a combination of two units by two phenotypes, therefore, four types of dentition are expected in the heterodont bivalves.In contrast to a whole transposition of gastropods with anatomical and shell asymmetry, a partial transposition is fairly common within the bivalves. The partial transposition may be caused by their symmetrical organization and may be selectively nearly neutral. The whole transposition in gastropods may lead to reproductive isolation, the partial transposition in heterodont bivalves brings high genetical diversity within a species.

对异齿双壳类科心蛤科（Cardytidae）、髁心蛤科（Condylocardidae）、厚壳蛤科（Crassatellidae）、星蛤科（Astartidate）、梯形蛤科（Trapezidae）、心蛤科（Cardiidae）、厚壳蛤科（Tellinidae）和帘蛤科（Veneridae）的铰链换位进行了研究，结果表明，除髁心蛤科（Condylocardidae）、心蛤科（Cardiidae）、厚壳蛤科（Tellinidae）和帘蛤科（Veneridae）外，其他科的铰链换位很少，主要发生在1.0%以下。任何瓣膜具有正常的前侧齿，都具有正常的主齿。在这些家族中，前侧齿和主齿可能是一个遗传连锁的单一单位，而后侧齿是另一个单位。每个单位由两种表型代表，即正常和换位牙列。因此，根据两个单位和两个表型的组合，异齿双壳类的齿系可能有四种类型。与腹足类的解剖和壳的不对称性相比，部分易位在双壳类中相当常见。部分换位可能是由它们的对称组织引起的，并且可以选择性地接近中性。腹足类中的整体转座可能导致生殖隔离，异齿类中的部分转座带来了物种内的高度遗传多样性。