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Coelotrophus nudus gen. et sp.nov., an endoparasitic copepod causing sterility in a sipunculan Phascolosoma scolops (Selenka and De Man) from Sado Island, Japan

Published online by Cambridge University Press:  06 April 2009

Ju-Shey Ho ,
Fumimasa Katsumi  and
Yoshiharu Honma
Ju-Shey Ho
Affiliation:
Department of Biology, California State University, Long Beach, California 90840
Fumimasa Katsumi
Affiliation:
Sado Marine Biological Station, Niigata University, Aikawa-machi, Sado Island 952–21, Japan
Yoshiharu Honma
Affiliation:
Sado Marine Biological Station, Niigata University, Aikawa-machi, Sado Island 952–21, Japan
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Summary

A new form of parasitic copepod, Coelotrophus nudus gen. et sp. nov., is described based on the specimens recovered from the coelomic cavity of a species of Sipuncula, Phascolosoma scolops (Selenka and Be Man), at Sado Island in the Sea of Japan. The new genus is distinguishable from its closest allies, Akessonia, Siphonobius and Staurosoma, in the complete absence of appendages in the female and the absence of a mouth in both female and male. The incidence of infection is fairly high (34·1%) in this population of P. scolops at Sado Island. Histological studies of the gonads and microscopical examinations of the coelomic fluid of P. scolops collected monthly from April through December, 1979 have revealed that the presence of C. nudus causes sterility in its host. Some infected P. scolops also showed a marked decrease in the number of corpuscles in the coelomic fluid.

Type
Research Article
Information
Parasitology , Volume 82 , Issue 3 , June 1981 , pp. 481 - 488
Copyright
Copyright © Cambridge University Press 1981

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References

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