Takeda & Miyake, 1972
Description of holotype: The carapace is transversely ovate and strongly convex longitudinally; the dorsal surface is divided into regions by shallow wide furrow, being uniformly covered with thick stiff setae and studded with pearly granules; the setae are various in length, but mostly short, arising singly or in a small tuft with two or three hairs; the pearly granules are small and rounded on the gastric and cardiac regions, become larger and conical on the antero-lateral regions, and almost absent from the intestinal region.
The front is strongly deflexed downwards; in the frontal view each lobe is strongly extended downwards and more or less angulated just near the median V-shaped sinus, being fringed with several rather conical granules; each lateral lobule is indicated by a conical granule of good size. The supraorbital border bears altogether nine conical granules, viz, four on the inner part, one in the middle, three on the lateral part and the last at the external orbital angle, the first four of which are smaller than the others; those parts are not deeply separated from each other, but indicated by the absence of the granules. The infraorbital border is setose and armed with several conical granules, of which three or four on the main part and two at the inner infraorbital angle are prominent; the interruption below the external orbital angle is fairly wide without granules, but not deep. The antennal basal segment is strong and just touched with the small ventral prolongation of the front by its inner angle; its exposed surface is ornamented with a pearly granule of good size near the outer angle. The third maxilliped is sparsely covered with longish setae; the ischium is glabrous, while the merus bears some sparse minute granules.
The antero-lateral border of the carapace is armed with three teeth behind the external orbital angle; the first is armed with two conical granules, the anterior one being the larger, while the last two are armed each with a stout, rather spiniform granule; the anterior one of the second and the third are weakly curved forwards. The subhepatic region is armed with several minute and one larger conical granules, the latter of which is subequal to the external orbital granule and visible from above between it and the first antero-lateral tooth. The postero-lateral border of the carapace is considerably inclined and slightly longer than the antero-lateral.
The chelipeds are short and stout, the left being the larger. The merus is almost concealed beneath the carapace; its upper border is rather thin and armed with a subterminal and a terminal spine, the subterminal interruption being deep; both spines are directed forwards and the terminal one is more prominent; the inner border bears two conical granules near the proximal end, the distal one of which is larger and rather spiniform. The carpus is large and uniformly covered with conical granules and stiff setae; those granules become larger towards the distal border near the articulation with the palm; the inner angle is not prominent at all, but a granule just near the angle is spiniform and the tallest of all the granules on the carpus; there is a row of five granules below the main spiniform granule. The palms of both chelae are very different in size from each other, but not in their armatures; the outer surface is thickly covered with conical granules and setae, the granules becoming larger towards the upper border; the granules on the smaller palm are accentuated, and three or four on the upper border are rather spiniform; in both palms the granules are not distinctly arranged longitudinally each with two or three indistinct rows in the median part. The fingers are short and granulated more than their half ways; the granules and the cutting edges of the smaller fingers are more accentuated than those of the larger ones as usual.
The ambulatory legs are covered and fringed with setae of various length. In each merus of the first three pairs the hairs on the upper surface are sparse and short, and there is only a terminal spinule which is so small and placed somewhat on the lower plane that it is readily overlooked, while the merus of the last pair is unarmed. In each of the carpi and propodi of all the pairs there are two longitudinal rows of several spiniform granules, one on the anterior border and the other on the upper surface near the anterior border; the granules on the anterior border are larger and greater in number; in each of both segments the surface between the two rows of the spiniform granule is rather concave and almost devoid of setae. (Takeda & Miyake, 1972b)
Type locality: Kominato, Chiba Prefecture, Japan.
Range: Japan - Kominato (Takeda & Miyake, 1972b), Tanegashima (Takeda, 1976b).