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Borradaile, 1903

Length of carapace about two thirds its width, its surface with some anterior tubercles, otherwise generally smooth, clypeiform expansions of carapace with broad teeth, typically developed, ambulatory legs are largely concealed in flexion below this structure; posterior border with low teeth, produced beyond the level of the posterior margins of the clypeiform expansion; front composed of two rounded teeth separated medially by a V-shaped sinus, no 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)

Carapace convex, 1.4 wide as long, surface finely punctate. Front only slightly projecting, with two rounded teeth separated by triangular sulcus. Basal antennal article with anterior proximal angle produced, peduncle emerging medially. Afferent branchial channel ending below orbit in rounded process. Endostomial septum visible with first maxillipeds closed, with slightly rounded anterior margin. First maxillipeds with small triangular notch on anterior margin. Branchial ridges prominent in young, barely distinguished, anteriorly with flattened tubercles. Antero-lateral margin carinate, scalloped. Clypeiform expansion smooth. Postero-lateral margin lamellar, with four marginally beaded laciniate teeth followed by two shallow teeth. Posterior margin produced, sinuous, finely beaded. Merus of cheliped distally with indistinctly quadrilobate lamina. Crest of larger chela with shallow teeth. External surface of chela obliquely traversed by three rows of flattened tubercles, median row most developed. Unevenly tuberculate ridge running subparallel to lower margin, from proximal lamellar tooth to base of dactyl, tubercles larger distally. Lower margin narrow, two beaded files contiguous distally. Internal surface of chela inferiorly granulate, beaded file parallel to lower margin. First male pleopod slightly curved, tapering apically to spinulate tip; second pleopod slender, slightly curved, tip spatulate. (Galil, 1997)

Type locality: Maldives.
Range: Zanzibar (Galil, 1997a); Seychelles (Galil, 1997a); Madagascar - Nosy Bé, Nosy Iranja, Majunga, Pearl Bank, and Antongil Bay (Galil, 1997a); Maldives - Haddumati and Mulaku Atoll (Borradaile, 1903a, Galil, 1997a); Burma - Gulf of Martaban (Galil, 1997a); west Malay Peninsula (Galil, 1997a); Korea - Cheju-do (Sakai, 1937a, 1976); Japan - (Galil, 1997a), Nakagusuku Bay, Okinawa-jima (Takeda & Shikatani, 1990); China - Guangxi and Hainan Island (Dai & Yang, 1991); Philippines - south of Manila Bay (Serène & Vadon, 1981), south of Luzon and Lingayen Gulf (Galil, 1997a); South China Sea - Nansha Islands (Chen & Xu, 1991); Thailand - Aokrabi, S. of Koh Samit, S. of Koh Sakait, Bangkok, and Phuket (Galil, 1997a); Indonesia - Sunda Strait and Timor (Galil, 1997a); Australia - Lindeman Island, Queensland (Ward, 1936), Dampier Archipelago (Tyndale-Biscoe & George, 1962), north-west coast, Gulf of Carpentaria, Torres Strait, Cairns, Darnley Island, Bowen, and Layoak Island (Galil, 1997a); New Caledonia (Galil, 1997a); 6-160 m.

Calappa clypeata