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The biology of colonial hydroids. I. The morphology of the polyp of Eirene viridula (Thecata: Campanulinidae)

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The colonial marine hydroid Eirene viridula Peron and Lesueur (Thecata, Campanulinidae) is readily maintained under laboratory conditions and reproduces in both vegetative and sexual modes. Polyps from these colonies displayed 4 distinct body regions, which were studied by comparison of light and electron micrographs of semi-thin and ultra-thin sections. Attention was directed chiefly to the epitheliomuscular and digestive muscle cells, found in all 4 regions and characterized by the presence of a central vacuole. Particular emphasis has been placed upon the coated vesicles and discoidal coated vesicles, which appear side by side in the digestive muscle cells of the stomach, and upon the central vacuoles typical of the muscle cells of the contractile parts of the body. The possible functional significance of these structures is discussed.

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This work was supported by the Deutsche Forschungsgemeinschaft.

Communicated by O. Kinne, Hamburg

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Hündgen, M. The biology of colonial hydroids. I. The morphology of the polyp of Eirene viridula (Thecata: Campanulinidae). Mar. Biol. 45, 79–92 (1978).

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  • Muscle Cell
  • Laboratory Condition
  • Electron Micrographs
  • Functional Significance
  • Body Region