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Rüppell, 1830

Carapace with 3 pairs of gastric ridges, epibranchial ridge interrupted by cervical groove and medially, otherwise perfectly smooth; front typically with 6 lobes, sometimes number reduced by fusion of medians and submedians; 5 antero-lateral teeth decreasing slightly in size from front to rear. Basal antennal joint with a low ridge bearing spare and rounded granules or tubercles. Upper surface of cheliped palm usually with 1 spine and a proximal tubercle on outer 2 spines on inner side; inner face of left limb only with a broad anterior eminence, otherwise smooth. Posterior border of propodus of swimming leg with about 5 spines and 4-6 small, inconspicuous tubercles. Male first pleopod long and thin, gradually tapering to tip; inner surface with an indistinct double row of subterminal bristles; outer surface without ornamentation. (Türkay 1995)

Front 6-lobed (sometimes 4-lobed), median frontal lobes much broader than laterals; 5 antero-lateral teeth; first antero-lateral tooth entire; fourth antero-lateral tooth large, same size as fifth; ridge on basal antennal joint with granules; inner surface of hand of cheliped smooth. (Davie 1999)

Type locality: southern Red Sea.
Range: Red Sea (Kossmann, 1877, Klunzinger, 1913, Apel & Spiridonov, 1998); Gulf of Aden (Apel & Spiridonov, 1998); Somalia - Bender Mtoni (Apel & Spiridonov, 1998); Kenya - (Apel & Spiridonov, 1998), Mombasa (Stephenson, 1972a); Zanzibar (Lenz, 1905); Mozambique - Delagoa Bay and Mozambique (Barnard, 1950); South Africa - Durban; Madagascar - (Apel & Spiridonov, 1998), Nosy Bé (Lenz & Richters, 1881), Nosy Bé, Mahajanga, Juan de Nova, and Toliara (Crosnier, 1962), north Madagascar (Stephenson, 1972a); Mauritius (Michel, 1964, Apel & Spiridonov, 1998); Seychelles (Rathbun, 1911, Apel & Spiridonov, 1998); Persian Gulf (Alcock, 1899a, Apel & Spiridonov, 1998); Gulf of Oman; Pakistan - Karachi (Alcock, 1899a, Stephenson, 1972a); India - Bombay (Alcock, 1899a, Chhapgar, 1957), Mandapam (Apel & Spiridonov, 1998); Andaman Islands (Alcock, 1899a); Mergui Archipelago (Alcock, 1899a); West Malay Peninsula - Pinang (Alcock, 1899a, Lanchester, 1902), Pisang Island, Malacca Strait (Shen, 1937), Thailand (Stephenson, 1972a); Western Sumatra - Airbangis (Apel & Spiridonov, 1998); Japan - Okinawa (Stimpson, 1907), Amami-Oshima, Okinawa-jima, Kume-jima, Ishigaki-jima, and Iriomote-jima (Minei, 1971), Amami-shoto and Okinawa (Sakai, 1976a), Ishigaki-jima (Miyake, 1983, Apel & Spiridonov, 1998), Okukubi River, Okinawa (Shokita et al., 1998), Ginowan, Okinawa (Shokita et al., 2000); Korea - Cheju do (Sakai, 1939); Taiwan - Kaohsiung, Chi-lung, and P'eng-hu (Lin, 1949), T'ai-pei, T'ai-nan, Kaohsiung, P'eng-hu, T'ai-tung Provinces and Chi-lung (Huang & Yu, 1997); China - Hong Kong (Stimpson, 1907), Ningbo (Shen, 1940b), Guangxi, Guangdong, Fujian, and Zhejiang (Dai & Yang, 1991); South China Sea - Paracel Islands (Yang et al., 1979); Singapore (Alcock, 1899a, Nobili, 1903c, Stephenson, 1972a); Philippines - Bucas Grande (Stephenson, 1972a), Bohol (Apel & Spiridonov, 1998); Sulu Archipelago - Tawitawi (Stephenson, 1975); Indonesia - Makassar and Ambon (Rathbun, 1910b), Ambon and Banda (Stephenson, 1972a), Maratua, Kepulauan Aru, Semau, Postillon Island, Sumbawa, Spermonde Archipelago near Makassar, Kepulauan Sula, Ambon, Seram, Haruku, Flores and Tukangbesi (Stephenson, 1975), Aru Islands and Ambon (Apel & Spiridonov, 1998); Palau (Sakai, 1939, Takeda & Hayashi, 1973, Takeda & Shimazaki, 1974, Sakai, 1976a); Admiralty Islands - Palm I. (Stephenson, 1972a); Mariana Islands - Saipan; Caroline Islands - Truk; Australia - (Alcock, 1899a), Albany Island (Miers, 1886), Broome (Rathbun, 1924c), Moa I., Murray I., Badu I., Goode I., Flinders I., Endeavour R., Woody I., Low Isles, Kent I., Palm I., Cardwell, Townsville, Magnetic I., Port Denison, Whitsunday Passage, Lindeman I., Hamilton I., Cannonvale, Facing I., Gladstone, Port Curtis, Bundaberg, Pialba, Moreton Bay, Exmouth Gulf, Groote Eylandt, Sir Edward Pellew Group, Indian I. and Darwin (Stephenson & Hudson, 1957), Sydney (Stephenson & Rees, 1968), Queensland (Apel & Spiridonov, 1998); Lord Howe Islands (Stephenson & Rees, 1968); New Caledonia - Nouméa, Nepoui, Ile des Pins, and Hienghéne (Takeda & Nunomura, 1976); Samoa (Alcock, 1899a); Tonga - Niuatoputapu (Stephenson, 1972a); Hawaiian Islands; Tuamotu Archipelago; intertidal.

Mangrove swimming crab (Thalamita crenata)