The shell structure of the Recent Patellogastropoda (Mollusca: Gastropoda)
The shell structure of the Recent Patellogastropoda (Mollusca: Gastropoda)
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DOI：
10.2517/prpsj.9.143
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发表时间：
2005-06-01
影响因子：
0.9
通讯作者：
Sasaki, Takenori
中科院分区：
文献类型：
--
作者：
Fuchigami, Takeshi;Sasaki, Takenori
利用扫描电镜观察了西北太平洋5科19属44种髌腹足类甲壳的显微结构。其结果是，17棱柱形，交叉，层状结构的微观结构被确认。通过种间比较，共划分出20个壳层结构群，这些壳层结构群是根据壳层的微观结构和排列方式划分的。分类群与壳结构组成的关系表明，现代髌腹足类在属水平上普遍具有独特而稳定的壳结构。这种高水平的一致性提供了一个坚实的基础，应用外壳结构特征来识别化石髌腹足类。然而，在缺乏强有力的同源性和位置标准进行比较的情况下，不同壳层的微观结构和同源性的进化过程大多是模糊的。应从系统发育、个体发育和矿物学角度探讨髌腹足类壳结构的变化过程。
The shell microstructure of 44 species belonging to 19 genera and 5 families of Patellogastropoda was observed by scanning electron microscopy on the basis of material mainly from the Northwest Pacific. As a result, 17 microstructures of prismatic, crossed, and lamellar structures were recognized. The comparison among species revealed 20 shell structure groups which are defined by microstructures and shell layer arrangement. The relations between taxa and shell structural composition indicate that the Recent patellogastropods generally have distinctive and stable shell structures at the genus level. This high level of consistency provides a firm basis for the application of shell structural characters to identify fossil patellogastropods. However, the evolutionary process of microstructures and homology across different shell layers are mostly ambiguous in the absence of robust phylogeny and undoubted positional criteria for comparison. More studies from phylogenetic, ontogenetic and mineralogical viewpoints should be undertaken to discuss the process of shell structure diversification in patellogastropods.