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Electron microscope study of the digestive system of Strongylocentrotus droebachiensis (Echinodermata: Echinoidea)

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Abstract

The fine structure of esophagus, stomach and intestinal epithelial cells of the sea urchin Strongylocentrotus droebachiensis have been examined. Three types of mucosal cells secreting neutral, acid and sulfated mucopolysaccharides have been found in the esophagus. The modes of origin of different types of mucous granules are described. Storage and zymogen cells have been identified in the stomach epithelium. Storage cells are adapted for intracellular digestion and synthesis of nutritive substance. Zymogen cells are adapted for enzyme synthesis. The columnar cells occur in the intestinal epithelium; they are adapted for nutrient absorption and lipid storage. Digestion in different parts of the digestive tract is considered in context with the ultrastructural and histochemical data obtained. Some problems concerning the relation between intracellular and extracellular digestion are discussed.

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Authors and Affiliations

  1. Institute of Marine Biology, USSR Academy of Sciences, Dalnie Zelentzy, Murmanskaya obl., USSR

    I. B. Tokin & G. F. Filimonova

  2. Laboratory of Cytology Institute of Marine Biology, USSR Academy of Sciences, Dalnie Zelentzy, 184631, Murmanskaya obl., USSR

    I. B. Tokin

Authors
  1. I. B. Tokin
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  2. G. F. Filimonova
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Communicated by M.E. Vinogradov, Moscow

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Tokin, I.B., Filimonova, G.F. Electron microscope study of the digestive system of Strongylocentrotus droebachiensis (Echinodermata: Echinoidea). Mar. Biol. 44, 143–155 (1977). https://doi.org/10.1007/BF00386954

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  • DOI: https://doi.org/10.1007/BF00386954

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