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Ultrastructural studies on the ciliated receptors of the long tentacles of the giant scallop, Placopecten magellanicus (Gmelin)

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Summary

The long tentacles of the Giant scallop Placopecten magellanicus (Gmelin) have been examined with light, scanning, and transmission electron microscopy. Three types of ciliated cells have been observed, one of which is located in specialised papillae born on the distal third of the tentacle. There are two separate cell types within the papillae. Type I cells are non-ciliated supporting cells, which form a capsule within which are found the Type II cells. These cells bear up to five cilia at their apices, and it is suggested that these are the receptor cells of the organ. No function has yet been determined for the receptors, but is suggested that they might be mechanoreceptors. A third cell type, Type III cells, occur at the base of the papillae. These cells bear many cilia and also macrocilia. Another ciliated cell type occurs on the proximal two thirds of the tentacle. These cells bear many cilia that are thought to be motile and not sensory.

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Correspondence to Dr. A. J. G. Moir.

Additional information

This research was supported by National Research Council of Canada Operating Grant No. A-6444 to Dr. V.C. Barber. Additional support came from the Department of Biology and School of Graduate Studies, Memorial University. Contribution No. 249 from the Marine Sciences Research Laboratory, Memorial University of Newfoundland

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Moir, A.J.G. Ultrastructural studies on the ciliated receptors of the long tentacles of the giant scallop, Placopecten magellanicus (Gmelin). Cell Tissue Res. 184, 367–380 (1977). https://doi.org/10.1007/BF00219897

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Key words

  • Ciliated receptor
  • Mollusca
  • Sense organs
  • Tentacles