Takeda & Kurata, 1977
Description of holotype: Carapace rather quadrate, slightly broader than long, and not markedly convex in both directions. Its dorsum slightly uneven anteriorly, with striated and sunken postero-lateral surface; surface behind fronto-orbital border and hepatic regions weakly depressed, and epigastric, protogastric, mesogastric and cardiac regions barely traceable; anterior end of each epigastric region more or less granulated.
Front about one-third as broad as carapace and slightly shorter than true posterior border of carapace, bearing a shallow median interruption; in dorsal view each lobe bordered with a series of conical granules and fairly convex forward in its middle and dorsally in its lateral part, while in frontal view anterior median part in front of this series of granules perpendicularly deflexed as an antennular anterior septum which is concave, bordered with granules and not bifid at its tip; ventral prolongation of frontal lateral end conical and its inner surface more or less concave as an outer part of antennular fossa. Supraorbital border with a series of tiny granules and a possible trace of interruption near the inner one-third. Infraorbital border also with granules larger than those on supraorbital border, bearing a deep incision at inner one-third; terminal lobe large, visible from above and tightly grasping antennal basal segment. Suborbital ridge beaded with minute granules. Antennal flagellum about two-thirds as long as major diametre of orbit, but bears a long aesthete and as a whole only slightly longer than major diametre of orbit. Third maxillipeds broad and completely closing buccal cavern; outer angle of merus not angulated nor auricular, and outer border itself strongly convex throughout its length.
Antero-lateral border of carapace slightly arched in front of an indistinct notch, and postero-lateral border behind it nearly longitudinal and twice as long as antero-lateral border.
Both chelipeds stout, equal to and similar to each other, being thickly covered with minute granules. Merus exerted beyond carapace by its distal half, and upper border not sharp. Carpus unarmed with inner angle generally rounded. Outer surface of palm with some longitudinal rows of granules in addition to thick covering of similar granules; inner surface with a strong protuberance near its proximal end, so that the palm tapers in upper view. Movable finger comparatively long and curved in accordance with immovable finger weakly bent down, being ornamented with some weak granulated longitudinal ridges; cutting edges of both fingers sharply toothed, each with some conical teeth; inner surface of each finger deeply excavated, distal part of cutting edge thus formed being reinforced by a horny half hoof; a prominent tuft of stiff setae disguises this structure.
Ambulatory legs rather stout and depressed. Third pair the longest, and first and fourth pairs subequal to each other and much shorter than the others. Meri widening distally and covered with conical granules on and along both borders; their anterior borders more or less crested and fringed with sparse, short soft hairs. Carpi also crested on anterior borders with granules; each upper surface of first three carpi with two longitudinal rows of granulated linear ridges which are united with each other at their bases and widely apart distally; posterior or shorter ridge with a fringe of silky longish hairs along its anterior edge; in last carpus ridges on upper surface almost indistinguishable; lower surfaces of first three carpi each also with a longitudinal granulated ridge. First propodus with two granulated ridges on and along anterior border, and with a longitudinal row of silky longish hairs throughout the length of shallow median depression; second and third carpi similar to preceeding carpus, but an additional ridge with a fringe of hairs along each posterior border; last carpus bears no median row of hairs, but both borders are densely fringed with hairs. Dactyli rather sparsely hairy, bearing two granulated ridges running along both borders; in each of last three dactyli a longitudinal ridge present on upper surface.
Abdomen rather narrow; terminal segment elongated with rounded tip, being twice as long as penultimate segment. First pleopod rather short, stout and not heavily calcified, bearing a terminal horny fringe nearly disguised by stiff setae. (Takeda & Kurata, 1977)
Type locality: Ogasawara-shoto, Japan.
Range: Japan - Ogasawara-shoto (Takeda & Kurata, 1977); Mariana Islands - north rim of Esmeralda Caldera (Türkay & Sakai, 1995).