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(Sakai, 1969)

This new species is closely related to Epialtus sulcirostris Stimpson from the Gulf of California, Mexico. The carapace is elongate pentagonal in outline. The rostrum is triangular with its apex prolonged into a process directed obliquely downwards and its lateral borders set with hooked hairs. The preorbital tooth is acuminate, while the external orbital tooth is rudimentary, and the supraorbital margin entire.
The anterior half of the antero-lateral border is anteriorly convergent and unarmed, while the posterior half bears three teeth, of which the middle one is the smallest and set a little closer to the third. The postero-lateral borders are slightly convex; the posterior border is very narrow with an obscure median tubercle. The dorsal surface of the carapace is almost flat, but the gastric and cardiac regions are somewhat convex.
The chelipeds are a little stouter and longer than the ambulatory legs. The merus and propodus are subequal in length and thickness, while the carpus is short and its outer edge slightly cristate; the fingers are short and unarmed. The ambulatory legs gradually decrease in length from first to last. The anterior border of the merus has two lobules, that of the carpus only a large one, and that of the propodus two smaller ones. The dactylus of all pairs is hooked at the tip.
The abdomen of the male holotype is composed of six segments.
Measurements: Length of carapace 9.1 mm, width of same 7.2 mm. (T. Sakai, 1969)

Type locality: Shirahama, Wakayama Prefecture, Japan.
Range: Red Sea - Elat (Griffin & Tranter, 1974); Mauritius (Griffin & Tranter, 1986a); Japan - Izu and Kii Shirahama (Sakai, 1976a); Sulu Archipelago - off Pulu Tongkil (Griffin & Tranter, 1986a); Indonesia - Salibabu Island, Paternoster Islands, north of Timor and Roti Island (Griffin & Tranter, 1986a); Australia - Lizard Island, Queensland (Griffin & Tranter, 1986a); Tasman Sea - Middleton Reef (Griffin & Tranter, 1986a); 13-72 m.

Menaethius orientalis