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(Herbst, 1783)

Carapace slightly depressed, branchio-cardiac groove distinct, hepatic region without strong vertical tubercle; lateral margins arched; front broad, deep, and strongly deflexed. Epistome not sunken transversely, its antero-lateral portion with two short and one interrupted straight ridge, which does not touch the straight upper border of the buccal cavern. Sternite of the chelipeds lightly coloured. Antero-external angle of external maxilliped narrowly conical, lateral margin rather straight. External surface of cheliped palm with two distinct ridges, finger tips broadly rounded and of white colour. Inferior distal extremity of last pair of ambulatory legs at most obscurely serrate in large specimens. Male abdomen with sixth segment much longer than fifth. Male first pleopod curved, not stout. (Türkay 1995)

Type locality: unknown.
Range: Red Sea; Dar es Salaam (Hartnoll, 1975); Mozambique (Barnard, 1950); South Africa - Natal (Barnard, 1950); Madagascar - (Crosnier, 1965), Nosy Bé (Lenz & Richters, 1881); Mauritius (Michel, 1964); Strait of Hormuz (Stephensen, 1945); Gulf of Oman (Stephensen, 1945); Japan - Ogasawara-shoto (Stimpson, 1907, Takeda & Kurata, 1977), Northern Daito-jima (Sakai, 1939), Amami-shoto, Yaeyama-retto, Daito-jima, and Ogasawara-shoto (Sakai, 1976a), Kuroshima, Yaeyama-retto (Miyake, 1983), Ginowan, Okinawa (Shokita et al., 2000); Taiwan - Lan-Yü (Sakai, 1939), Lan-Yü and Chi-lung (Lin, 1949); South China Sea - Paracel Island (Chen, 1975), Hainan Island and Paracel Islands (Dai & Yang, 1991), Nansha Islands (Chen & Xu, 1991); Indonesia - Buru Island and Sorong, Irian Jaya (Rathbun, 1910b); Papua New Guinea - Bertrand Islands (Sendler, 1923); Australia; Hawaiian Islands - (Edmondson, 1959), Hilo, Lanai Island beach, Papai Oama, Kauai, Necker Island and Laysan (Rathbun, 1906); Line Islands - Palmyra and Tabuaeran (Edmondson, 1923); Tahiti; Tuamotu Archipelago - Makatea (Sendler, 1923); intertidal zone.

Grapsus tenuicrustatus