Ward, 1942
The carapace is narrow and quadrate, being covered with rather dense longish and long hairs; most of the long hairs are brush-like and disguise the areolation of the carapace; the proper dorsal surface is weakly areolated with shallow interregional furrows, and the frontal, mesogastric, protogastric, hepatic, and cardiac regions are traceable; the hepatic and cardiac regions are usually rather convex than the others; the dorsal surface is for its greater part smooth, but the protogastric, hepatic, and postero-lateral regions are more or less roughened by blunt but rather conical granules. The front is strongly produced and declivous downwards, being cut into two truncated lobes by a median, deep, wide sinus; the sinus is so deep that its median proximal part or the bottom is just in a level of the interantennular septum in the obliquely upper view; the lateral part of each lobe is rounded and then very deeply concave, bearing the blunt lateral lobule that is rather directed downwards and distinctly separated from the supraorbital angle by the dorsal sulcus.
The antero-lateral part of the lateral border of the carapace is much shorter than the postero-lateral, being armed with two prominent spine-tipped teeth behind the external orbital angle; the first of the two is more stout with a more curved spine at the tip; just at the posterior end of the second is a vestige of the third tooth which is usually indicated by a granule of good size but almost indistinguishable in some specimens. The postero-lateral border is nearly longitudinal or very slightly inclined, being granulated together with its dorsal surface.
The orbit is large, but not markedly transverse; the supraorbital border is granulated and fringed with setae, bearing two distinct depressions; the border between the depressions is weakly convex, and the outer border of the lateral depression is directed obliquely forwards as an inner border of the external orbital angle; in the dorsal view the external orbital angle is conical and rather lobulate, being bordered with three or four conical granules each along the inner and outer borders. The infraorbital border is prominently raised and fringed with setae and conical granules, bearing a notch below the external orbital angle; the inner infraorbital angle is extended forwards and convex ventrally, being thickly covered with setae; the inner extremity of the inner infraorbital angle is rounded and broadly touched with the wide and flattened basal segment of the antenna; the inner angle of the antennal basal segment is rather broadly touched with the ventral prolongation of the front; the second and third segments are also stout and provided each with a tuft of two or three hairs at the outer angle; the flagellum with sparse long secondary hairs are very long and exceeds twice the length of the major diametre of the orbit. The third maxillipeds are rather wide but leave a narrow gape in the middle; the ischium is provided with sparse longish brush-like hairs along the outer border and with a fringe of long hairs on the inner border, the exposed surface being for its greater part sunken; the merus is quadrate, and its inner proximal part is obliquely cut out, so that a deep transverse V-shaped sinus is left between the ischium and merus.
The chelipeds are rather short and subequal in both sexes; however, in reality, the male chelae are only slightly unequal in close comparison with each other and possibly larger than those of the female. The upper border of the merus is armed with one or two conical granules of good size at the proximal part and a high, tuberculated subterminal tooth that is rather thin distally and tipped with a spinule or conical granule; the terminal spinule of the upper border of the merus is present, but in some specimens worn out or broken off to be a conical or blunt granule. The carpus is covered with setae and long hairs, being roughened by the sparse conical granules; among the granules two along the inner border are always larger than the others and in the appearance of the spinules; of the two the distal one near the middle of the border is more prominent and weakly curved outwards; the inner angle of the carpus is produced into a very high tubercle tipped with a spine. The palm is entirely covered with conical granules, setae and long hairs like the carpus; those granules are somewhat beaded to form some longitudinal rows, and a longitudinal shallow furrow along the upper border is traceable. The fingers are rather long, but stout, being covered with setae and longish hairs nearly to the tips; in each of the movable and immovable fingers the outer surface is impressed with two longitudinal distinct furrow, one along the cutting edge and the other along the border; in addition, in the movable finger is a similar but less prominent furrow on the inner surface near the upper border, while the lower border of the immovable finger bears also a furrow; those furrows are rendered ridge-like; the inner surfaces of the movable fingers are deeply hollowed and the tips are also excavated; the cutting edges are regularly and very sharply toothed along the whole lengths.
The ambulatory legs are markedly slender and densely fringed with long hairs. In the first three pairs each merus is roughened by conical granules near the proximal end and armed with a strong spine associated with some long hairs on the anterior border; very rarely the spine is absent only with a tuft of hairs; in all the legs each of the meri is provided with a subterminal tuft of long hairs and armed with a terminal spine which is much smaller than the spine of the anterior border but always distinct. The carpus is ornamented with a longitudinal furrow, and on the upper surface along the furrow the long hairs are more prominent than the anterior border. The propodus is more or less depressed and also provided with a longitudinal shallow furrow that occupies most of the upper surface. (Takeda, 1971)
Type locality: Mauritius.
Range: Mauritius (Ward, 1942b, Michel, 1964); Japan - Ishigaki-jima (Takeda, 1971); Vietnam - Nha Trang (Serène, 1971); Palau (Takeda, 1971).