Taxonomy of shrimps of the genus Nematocarcinus (Decapoda, Nematocarcinidae). 5. Redescription of Nematocarcinus nudirostris and description of N. combensis, N. kalensis, and N. subtilis

摘要

The disto-ventral organ of the 6th abdominal segment was found for the first time, and in was a cause to redescribe shrimps of the genus Nematocarcinus. The diagnosis of the species N. nudirostris, described previously by the author, was corrected and reduced to synonym of the species N. combensis. Three new species. N. combensis, N. kaiensis, and N. subtilis, from various regions of the Indian Ocean and western part of the Pacific Ocean are described. They differ from N. nudirostris in the structure of rostrum, protuberance of the back border of the 3d abdominal segment, pleurae of the 5th abdominal segment, and that of the disto-ventrla organ.