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(Linnaeus, 1758)

Monotypic genus, genus definition repeated:
Carapace broadly oval, length/breadth ratio 6:5, surface spined and tuberculated; fronto-orbital border slightly about half the greatest width of carapace; seven fronto-orbital spines. Eye peduncle three segmented, folding longitudinally. Dorsal border of cheliped palm with two large teeth. Posterior margin of propodus of fourth pereiopod without spines. Fifth pereiopod, compared to the preceeding ones, not reduced in size. (Türkay 1995)

Type locality: India.
Range: east Africa; South Africa - Durban, Zululand coast (Barnard, 1950); Mozambique - Delagoa Bay (Barnard, 1950); Réunion (Ortmann, 1892): Mauritius (Bouvier, 1915b, Michel, 1964): Japan - (de Haan, 1841), Tokyo Bay and Kochi (Ortmann, 1892), Owase (Yokoya, 1933), Shimoda (Sakai, 1935a), Manazuru and Shimoda (Sakai, 1937a), Hachijo-jima (Sakai, 1954), Amakusa (Miyake et al., 1962), Sagami Bay (Sakai, 1965b), Sagami Bay, Shimoda, Kii Nagashima, Kii Minabe, Ashizuri-misaki, and Amami-Oshima (Sakai, 1976a), Nanki Kushimoto (Miyake, 1983), Mikawa Isshiki, Kii Minabe and Yoron-jima (Muraoka, 1998); Korea - Zenra-nando and Keisho-nando (Kamita, 1941b), Cheju-do (Kim, 1970); Taiwan - (Sakai, 1937a, Dai & Yang, 1991), Chi-lung and P'eng-hu (Lin, 1949): China - Hong Kong (Shen, 1931a), Paracel Island (Chen H., 1975), Guangxi, Guangdong, and Paracel Island (Dai & Yang, 1991); Indonesia - Tiur Island (Ihle, 1918); Australia - Abrolhos Islands (Tyndale-Biscoe & George, 1962), Cape Moreton (Campbell, 1971); Hawaiian Islands - Sandwich Island (Dana, 1852c); Marquesas - Eiao, Fatu Hiva and Nuku Hiva (Poupin, 1996a); 20-100 m.

Frog crab, red (Ranina ranina)