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(Linnaeus, 1758)

Length of carapace much less than two thirds of its width, its surface indistinctly tuberculated on anterior half but with wavy beaded lines towards the posterior surface, clypeiform expansions of carapace with entire and smooth edges, typically developed, ambulatory legs are largely concealed in flexion below this structure; front composed of two rounded teeth separated medially by a V-shaped sinus and provided externally with small accessory tubercles at their bases. The longitudinal septum of the prolongated portion of the endostome can be seen extending between the lamellar processes of the first pair of maxillipeds. (Türkay 1995)

Type locality: Ambon.
Range: Kenya - off Mombasa (Galil, 1997a); Zanzibar; Seychelles - Praslin Island (Rathbun, 1911), N. of Bird Island and Aldabra Island (Galil, 1997a); Madagascar - Nosy Bé and Morombe (Galil, 1997a); Indian Ocean (Galil, 1997a); Mauritius (Michel, 1964); Andamans (Alcock, 1896); Japan - Amakusa and Kyushu (Sakai, 1937a), Hachijo-jima (Sakai, 1954), Amakusa (Miyake et al., 1962), Sagami Bay, Kii Nagashima, Kii Minabe, Yoron and Ishigaki-jima (Sakai, 1976a), Nanki Shirahama and Kushimoto (Miyake, 1983), Nakagusuku Bay, Okinawa-jima (Takeda & Shikatani, 1990), Nakamura, Kochi Pref., Muroto-misaki, Kushimoto, and Ogasawara-shoto (Galil, 1997a), Ginowan, Okinawa-jima (Shokita et al., 2000); Taiwan; Philippines - Borocay Island (Galil, 1997a); Palau (Takeda, 1973d); Indonesia - Nusa Laut, Banda, and Kur Island (Ihle, 1918), Moluccas, Ambon, Ternate, and Selat Lembeh (Galil, 1997a), Sekru, Manokwari and Mansiman nr Manokwari, Irian Jaya (Galil, 1997a), Kepulauan Aru; Papua New Guinea - New Britain (Galil, 1997a); Western Australia - Shark Bay and Abrolhos Islands (Tyndale-Biscoe & George, 1962); New Caledonia (Galil, 1997a); Hawaiian Islands - Oahu (Rathbun, 1906, Galil, 1997a); Marquesas Island - Nuku Hiva (Galil, 1997a); Society Islands - Raiatea (Galil, 1997a); intertidal to 50 m.

Calappa calappa