Internal Microstructure of the Shell of Argonauta argo

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  • KOBAYASHI Iwao
    Department of Geology and Mineralogy, Faculty of Science, Niigata University

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  • アオイガイ (Argonauta argo) の擬殼の内部構造
  • アオイガイ(Argonauta argo)の擬殻の内部構造
  • アオイガイ Argonauta argo ノ ギカク ノ ナイブ コウゾウ

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The internal microstructure of the "shell" of Argonauta argo was examined by light and electron microscopies. The shell is composed of outer prismatic, middle and inner prismatic layers (Text-fig. 2). The structure of the outer prismatic layer is the same to that of the inner prismatic layer. They are formed by elongate polygonal prisms and interprisms around them. Each prism erects nearly perpendicular to the shell surface. In the interprism, there are lace-like reticulated sheets, which are morphologically similar to organic matrixes of a nacreous layer of various bivalves. Although the structure of the middle layer is obscure, this layer also includes organic matrixes. The histological and histochemical reactions of decalcified organic matrixes are shown in the Table 1. The matrixes seem to be composed of protein, neutral mucopolysaccharide and mucopolysaccharide.

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