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(Ihle, 1918)

The carapace of this species is proportionally longer than that of Alox rugosum; its grooves along the antero-lateral borders are much broader and eroded, furnished with mushroom-like granules. The grooves along the postero-lateral borders are quite irregular, interruped by nodules and lobular protuberances of the branchial regions. The intestinal and branchial regions are convex and eroded, circumferenced by depressions, which are as aforementioned, furnished with mushroom-like granules. The same granules are found thickly arranged along the median line, forming a longitudinal ridge connecting the front with the intestinal hump. The hepatic angles have a narrow facet, which is surrounded by fine granules; such facets are also observed on the branchial humps, some elongate but some small and circular. The posterior border is obtusely bilobed, the lobes being granulated.
The chelipeds are as in Oreophorus rugosus, but both borders of the arm and the inner border of the palm are armed with a row of whitish tubercles. The ambulatory legs are also covered with fine granules, some of which are conspicuous and whitish, and are arranged on the anterior and posterior borders of the merus and carpus.
The abdomen of the female consists of five pieces, the first tergum is covered by the posterior border of the carapace, and the fourth to sixth terga are fused together but their suture lines are perceptible. (Sakai, 1937)

Type locality: Kepulauan Kai, Indonesia, 5°36.5'S, 132°55.2'E, "Siboga" stn 260, 90 m.
Range: Japan - Sagami Bay (Sakai, 1937a, 1965, 1976), Shiono-misaki (Takeda, 1979a); Philippines - south of Tablas Island (Chen H., 1989); Indonesia - Kepulauan Kai (Ihle, 1918); New Caledonia - (Tan & Ng, 1995); Australia - off Cape Moreton (Griffin, 1972); 50-90 m.

Alox ornatum