Shell microstructure of the Veneridae ( Bivalvia) and its phylogenetic implications.

M. Shimamoto

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)

    Abstract

    The shell microstructures of 65 extant species of the family Veneridae (Bivalvia) have been described with the aid of thin sections, acetylcellulose replicas, optical microscopy, and scanning electron microscopy. Venerid shells consiost of combinations of five microstructure types: composite prismatic, crossed-lamellar, fine crossed-lamellar, homogeneous and complex. The combinations of microstructure types outside the pallial line is generally uniform among individuals of a species, but some intraspecific variation in shell microstructure is recognized within inner shell layers. However, both microstructure types are sometimes observed among individuals of the same species, and they may even coexist within a single inner shell layer in a certain species. Most venerid subfamilies are each represented by a single shell microstructure type. However, two or three shell structure types coexist within the subfamilies Chioninae, Tapetinae, and Callistinae. As to geographical distribution, venerids with composite prismatic structure show a more northerly distribution around the Japanese Islands than venerids lacking composite prismatic structure. From available palaeontologic data, inferred phylogenetic trends in venerid shell microstructure are described.-from Author

    Original languageEnglish
    JournalScience Reports - Tohoku University, Second Series: Geology
    Volume56
    Issue number1
    Publication statusPublished - 1986 Jan 1

    ASJC Scopus subject areas

    • Environmental Science(all)
    • Earth and Planetary Sciences(all)

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