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Henderson, 1893

This species differs from Arcania heptacantha only in the following few points:
The carapace is armed with only five marginal spines instead of seven; the two lateral and median intestinal spines being most prominent and one on either side of the posterior border being very small. On the postero-lateral borders, there is a very small tubercle which corresponds to the postero-lateral spine of A. heptacantha. The pterygostomial regions are also armed with a tubercle.
The carapace in life is yellowish vermilion with several reddish spots on the anterior surface and with a large reddish ocellus, which is circumferenced with milk-white, on the cardiac region. Fingers are nearly twice the length of the palm, thus they are proportionally longer than in A. heptacantha. (Sakai, 1937)

Type locality: off Madras coast, India.
Range: Red Sea (Galil, 2001a); Persian Gulf (Alcock, 1896); Strait of Hormuz (Stephensen, 1945); Oman (Galil, 2001a); Madagascar (Galil, 2001a); Laccadive Islands; India - (Galil, 2001a); off Madras coast (Alcock & Anderson, 1894b), Ganjam and Vizagapatam (Alcock, 1896); Sri Lanka (Alcock, 1896); Arakan (Alcock, 1896); Singapore (Galil, 2001a); Japan - Sagami Bay (Sakai, 1937a, 1965), Sagami Bay and Tosa Bay (Sakai, 1976a), Shiono-misaki (Takeda, 1979a), Tosa Bay (Miyake, 1983); Taiwan - Tingch'ieting (Lin, 1949); China - Hainan Island (Dai & Yang, 1991); Vietnam; Philippines - south of Manila Bay and Verde Island Passage (Serène & Vadon, 1981), south of Manila Bay, north of Lubang, Verde Island Passage, Mompog Pass and north of Panay (Chen H., 1989); Palau (Takeda 1973); Indonesia - Borneo Bank and Saleh Bay (Ihle, 1918); Vanuatu (Galil, 2001a); New Caledonia (Galil, 2001a); 21-366m.

Arcania gracilis