日本産Plesionika属のエビ2種について

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During the course of our research on the Japanese pandalid shrimps, we found a great izumiae OMORI. As mentioned by OMORI (1971), P. izumiae is rather easily distinguished from P. binoculus by having 1) small size, less than 50mm in total length and 8mm in carapace length, 2) no postrostral crest, 3) long dactyli of the last three pereiopods, about half as long as the propodi and 4) "faintly reddish orange" color in the carapace and abdomen. P. binoculus is more than 100 mm in total length and 21 mm in carapace length and bears a prominent postrostral crest and relatively short dactyli of the last three pereiopods. An oval red circle on either side of the third abdominal somite is most remarkable in P. binoculus. Neverthless almost all previous records were done under the name P. binoculus (URITA, 1921; YOKOYA, 1933; MlYAKE, SAKAI & NlSHIKAWA, 1962; FUJINO & MlYAKE, 1970 and ZARENKOV, 1971, etc.) or Plesionika sp. (YASUDA, 1955; KUBO & ASADA, 1957; UTINOMI & HARADA, 1958, etc.). Fortunately we could reexamine a part of the material of them or examine some specimens from the same localities or near the localities, from which the above-mentioned authors collected their P. binoculus or P. sp. We conclude from these examinations that these P. binoculus or P. sp. in literature do not belong to the true P. binoculus but to P. izumiae. P. binoculus is very rare and usually collected solitarily from rather deep water. The present specimens, which are the first record of this species from Japan, were collected from Tosa Bay, Kochi Prefecture. P. izumiae is distributed all over Japan, except for Hokkaido and the Pacific coast of the Tohoku District. In the Pacific coast of southern Japan it is much abundant in depths varying from 40 to 80 m.
日本動物分類学会の論文
1976-12-20

日本産Plesionika属のエビ2種について

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