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On a probable sense organ newly found in some eunicid polychaetes

Published online by Cambridge University Press:  09 October 2019

I. Hayashi  and
S. Yamane
I. Hayashi
Affiliation:
Department of Fisheries, Faculty of Agriculture, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606–01, Japan
S. Yamane
Affiliation:
Department of Animal, Grassland and Fishery Science, Faculty of Agriculture, Miyazaki University, Gakuen Kibanadai, Miyazaki City, Miyazaki 889–21, Japan
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Abstract

Through SEM observations a probable sense organ located at the base of the ventral side of each dorsal cirrus in some eunicid polychaetes is described. This organ is externally characterized by numerous long ciliary projections. Similar structures are also found on corresponding positions in species belonging to other family groups in the Order Eunicida but in the Order Phyllodocida were found only in Aglaophamus sp. This species also has a similar structure, with ciliary projections, at the ventral base of each dorsal cirrus. However, the situation is quite different from any Eunicida species in that numerous bundles of ciliary projections are also scattered on the lateral sides of the body. Although the function of the ciliated organ of eunicids still remains unknown, a brief TEM observation of this organ on Marphysa sanguinea clearly shows that this organ is a sensory receptor and seems to suggest that it serves as a chemoreceptor rather than a mechanoreceptor.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 74 , Issue 4 , November 1994 , pp. 765 - 770
Copyright
Copyright © Marine Biological Association of the United Kingdom 1994

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