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de Man, 1887

The carapace is narrow, strongly convex anteriorly and very slightly so from side to side; the surface bears no indication of regions, thickly covered with tufts of and single yellow setae mixed with very scant longish ones, being slightly roughened by distant granules of good size near the antero-lateral borders; those setae are almost uniformly disposed on the dorsal surface except for the postero-lateral surface.
The front is slightly less than one-third the greatest breadth of the carapace, deflexed and somewhat produced in the middle; two median lobes are obliquely truncated and passes continuously into the supraorbital border, being fringed with several long hairs just near the median small sinus. The supraorbital border is nearly entire, and minutely granulated at the inner part and roughly at the outer part; the inner part of the supraorbital border is extended back parallel to the median line and makes a right angle with the outer part of the border, the latter being horizontally extended; thus the orbit is triangular in the obliquely-upper view. The external orbital angle is not prominent, but is marked by a granule of good size which is as prominent as the granules on the antero-lateral borders. The infraorbital border is also granulated, setose laterally and bears a closed fissure near the external orbital angle; the inner angle of the basal antennal segment is just touched with the ventral prolongation of the front, while its outer angle fails to reach the level of the inner infraorbital angle which is not produced in a tooth; the antennal flagellum is not provided with secondary hairs and is as long as the major diametre of the orbit. The third maxillipeds are usual form and entirely close the buccal cavern, being covered with scant long hairs.
The antero-lateral border is arched and cut ino four lobular teeth by three shallow interruptions; each tooth is bordered with four or five granules of good size, one or two of which are usually more prominent than the others; the first tooth is so less prominent than the others that it is not protruded from the contour of the carapace, and is confluent with the external orbital angle; the second and third teeth are subequal, whereas the last one is less prominent than the preceedings. The subhepatic region is not hairy and is only minutely granulated without spines or spinules. The postero-lateral border is equal in length to the antero-lateral, and rather strongly convergent just after the end of posterior slope of the last antero-lateral tooth.
The chelipeds are short, heavy and unequal in both sexes. The merus is entirely concealed under the carapace. The carpus is thickly covered with granules and short setae on the outer surface, being impressed with a shallow furrow parallel to the distal margin; its inner angle is provided with a prominent granule, but not produced in a tooth, beneath which the border is fringed with a row of long hairs. The palm of the larger chela is thickly covered with granules interspaced with short setae like the carpus on the upper, outer and lower surfaces; its upper border is fringed with a row of large granules and long hairs, being somewhat crest-like; the smaller palm is nearly like the larger one, the granules and setae on the lower surface being more prominent than those on the larger chela. The immovable finger of the larger chela is short, stout and forms a straight line with the lower border of the palm, its cutting edge bearing three blunt teeth; in the smaller fingers three sharp teeth are present on the distal half of the immovable one, and proximally a small gape is left when the fingers are closed.
The ambulatory legs are comparatively long, stout and thickly covered with setae mixed with longish ones on the entire upper surface. The upper border of the merus is very minutely granulated. Each carpus and propodus are rather prominently granulated near the upper borders. The dactylus is shorter than the preceeding segment and ends in a sharp terminal claw. (Takeda & Miyake, 1969c: 97)

Type locality: Sullivan Island, Mergui Archipelago.
Range: Burma - Kyuk Phyu Harbour (Alcock, 1898); Mergui Archipelago (de Man, 1887b, Alcock, 1898, Chopra & Das, 1937); Japan - Okinoshima Islet, Fukuoka Pref., and Ariake-kai (Takeda & Miyake, 1969c); Philippines - Gulf of Davao and Jolo (Garth & Kim, 1983).

Actumnus elegans