日本初記録のCancer magister DANAホクヨウイチョウガニ(新称)
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概要
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One male specimen of the Cancroid Crab was obtained by a smelt-beam trawl from a depth of 15m, off Kushiro, the Pacific coast of Hokkaido, on November 16, 1979. It was identified by Dr. T. SAKAI of the Carcinological Society of Japan as Cancer magister DANA. This crab is one of the important provision resources in U.S.A. (Known as the dungeness crab or common edible crab), ranging along the Pacific coast of North America, from Unalaska, Alaskan Peninsula, south-ward to Montebery Bay, California. It has recently been imported from America to Japan as an edible crab, sold at the markets of Tokyo and Yokohama by the false name of "American swimming crab". Cancer magister is morphologically characterized by having the carapace widest at the last or tenth antero-lateral tooth, and the antero-lateral teeth are low and their tips directed forwards. The postero-lateral borders are unbroken and entire. Fingers of chelipeds are not pigmented with black color. This crab was obtained for the first time in Japan as well as in the north-western Pacific areas. The author is not certain whether this crab was migrated from northwestern coast of America of Alaska, by influence of the cold northern current, or its young or larval crab had been transported by means of the ballast water tunk of a ship. On the other hand, the author's interest has been aroused by the fact that the five American and Alaskan flounder-Embassichthys bathybius had been recorded for the first time in the Pacific coast of Hokkaido by AMAOKA et al. in 1978 (loc. cit.).
- 日本甲殻類学会の論文