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(Tilesius, 1815)

Carapace well areolate, the areolae with distinct patches of granules and granular crests; lateral epibranchial spine rather stout and short, all lateral spines with granulated borders; the four frontal teeth are subequal end equidistant, the median frontal incision is evident, deep and narrow. Chelipeds shorter than first ambulatory legs, upper border of palm and carpus with numerous spinules, carpal spine strong. Second to fifth pereiopods with dactyli not very flattened. Penultimate segment of female abdomen deeply sinuate on outer borders. (Türkay 1995)

Type locality: Awatscha Bay, Kamchatka.
Range: Japan - Nemuro, Kushiro, Muroran and Abashiri, Hokkaido (Sakai, 1976a), Yamagata Prefecture (Suzuki S., 1979), Nemuro (Miyake, 1983), Kitamimonbetsu, Erimo and Akkeshi (Komai et al., 1992); Korea - Bu-geo Myeon (Kamita, 1941); Puget Sound (Dana, 1852); from north-eastern Siberia, Kamchatka, Kurili Islands, Bering Sea to California.

Helmet crab (Telmessus cheiragonus)