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(Linnaeus, 1758)

Carapace convex, smooth; hepatic and frontal regions marked with fine net-like corrugation. Surface with 11 symmetrically disposed red blots, cardiac region with a
“) (“-shaped shallow hollow. Front with a lobate process and divided into 2 lobules by a depression in the median. Orbit small; inner superorbital teeth larger than frontal lobe and slanted antero-laterally; the distance between inner superorbital teeth subequal to one-third of carapace breadth; outerorbital teeth obtusely round. Antero-lateral margin arched, longer than postero-lateral margin; conjunctive site between antero-lateral and postero-lateral margins armed each with an obtuse tooth.
Chelipeds of the female asymmetrical; surface smooth. Fingers of major chelipeds each with truncated stout tooth in proximal half of the inner margins; fingers of minor chelipeds slender, teeth on the inner margins indistinct. Ambulatory legs with merus subcylindrical; dactylus elongate and slender, claw-shaped at tip. Female abdomen oblong, 7-segmented; telson acutely triangular. Carapace length of the female 45-90 mm, breadth 62.8-122 mm. (Dai & Yang, 1991)

Type locality: Asia.
Range: Red Sea; Kenya - Ras Iwatine; Mozambique (Stebbing, 1920b); South Africa - Durban (Barnard, 1950); Madagascar - Nosy Bé; Mauritius (Bouvier, 1915b, Michel, 1964); Palk Strait (Alcock, 1898); Andaman Islands (Alcock, 1898); Nicobar Islands (Alcock, 1898); Sumatra - Banda Aceh; Japan - Kagoshima Bay, Northern Daito-jima and Ogasawara-shoto (Sakai, 1939), Hachijo-jima (Sakai, 1954), Kii Minabe, Kagoshima Bay, Amami-Oshima, Ishigaki-jima and Ogasawara-shoto (Sakai, 1976a), Yoron-jima (Muraoka, 1998); Taiwan - Tan-shui (Sakai, 1939), Tan-shui and Hua-lien (Lin, 1949); China - Hainan Island and Paracel Islands (Dai & Yang, 1991); Philippines - Manila (Dana, 1852); Indonesia - Noordwachter Island and Ambon (de Man, 1887d); Palau (Takeda, 1976a); Australia; Hawaii - Honolulu (Miers, 1886), Honolulu, Puako Bay and Hilo (Rathbun, 1906); Line Islands - Tabuaeran (Edmondson, 1923); Tahiti (Stimpson, 1907); Tuamotu Archipelago - Raraka (Dana, 1852), Mataiva (Crosnier, 1984).

Seven-eleven crab (Carpilius maculatus)