Morphological modifications caused by two sacculinid parasites of the grapsid crab Cyclograpsus intermedius

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概要

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• The grapsid crab Cyclograpsus intermedius Ortmann, 1894 in the Amakusa Islands, Japan, is parasitized by two sacculinid parasites: Sacculina oblonga Liitzen & Yamaguchi, 1999 and Sacculina confragosa Boschma, 1933. Average prevalences at four sites are 1.6 to 12.1 % in S. oblonga and 0.4 to 1.5 % in S. confragosa. The number of externae attached to crabs infected with S. oblonga is only one without exception. Most of the crabs parasitized by S. confragosa had one externa but a few crabs had two or three externae attached. A significant difference in infection rate between the sexes was found in S. oblonga. Female crabs seem to be more commonly infected by the parasite. The morphological modification is more significant in smaller males than in larger crabs.

• 日本甲殻類学会の論文

著者

• YAMAGUCHI Takao

  Aitsu Marine Biological Station, Faculty of Science. Kumamoto University

• Takahashi Tohru

  Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto

• Aratake Hisamichi

  Division Of Fisheries Miyazaki Prefectural Government

• Takahashi Tohru

  Faculty Of Environmental And Symbiotic Sciences Prefectural University Of Kumamoto

• Takahashi Tohru

  Faculty Of Agriculture Niigata University

• Yamaguchi Takao

  Aitsu Marine Biological Station

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