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A. Milne Edwards, 1865

The carapace of this rare species is peculiar in shape; the postocular and post-hepatic constrictions being remarkable; the supraocular eave extremely dilated to form a hollowed orbit, and its posterior angle prolonged into a long spine but with no preocular spine. The true rostral spine is slender and projecting almost perpendicularly; the pseudorostral spines are extremely long and widely separated, subparallel or very slightly divergent anteriorly.
The dorsal surface of the carapace is sparingly beaded with granules, some of which are decorated with curled hairs. One long spine on the gastric region a little behind the middle, and two short spines placed side by side on the cardiac centre, one small spine in the intestinal centre and two of a medium size side by side on the lobe of the posterior margin; the hepatic region has two spines, of which the posterior one is most prominent of all the spines of the carapace save the pseudorostral spines. The postocular spine is very small, the branchial regions have two prominent marginal spines and one dorsal spine near the lateral angle. The basal segment of antenna is longitudinally sulcated and sparingly granulated, its antero-external angle armed with a very stout spine.
Chelipeds are not very robust, arm granulated, having four or five spines on the superior border and two terminal ones, the latter being invariably acuminate; the wrist is also granulated but without any stout spine contrary to A. M. Edwards' figure; the palm is smooth, fingers not gaping and are uniformly denticulated.
Ambulatory legs are very slender and cylindrical, sparingly furnished with long hairs over the whole surface, with curled hairs along the anterior border. Each segment is unarmed
Abdomen of both sexes consists of seven distinct segments. (Sakai, 1938: 247)

Type locality: New Caledonia.
Range: Japan - Nanki Shirahama and Gobo (Sakai, 1938a), Kii Peninsula (Sakai, 1976a), Kii Nagashima (Miyake, 1983), Kii Minabe and Mimase (Muraoka, 1998); Indonesia - Kepulauan Kai (Griffin & Tranter, 1986a); north-eastern Australia; Lord Howe Islands; Vanuatu; New Caledonia (A. Milne Edwards, 1865); 10-56m.

Picroceros armatus