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(Adams & White, 1848)

The general aspect of animal resembling that of the genus Atergatis but the antero-lateral borders and ambulatory legs are not at all crested. The carapace transversely subquadrilateral, the dorsal surface very smooth and markedly convex from before backwards and also moderately so from side to side; the regions are well demarcated by broadish grooves, i.e., 2M, 3M, 2L+3L, 4L, 5L, 1R are respectively well defined.
The two frontal lobes are markedly produced near the median notch and their lateral angle obtusely lobulate. Antero-lateral borders are well arcuate and divided into four lobes exclusive of the small external orbital angle; the anterior two lobes being subequal, the third longest, and the last one very short and somewhat dentiform. The inner angle of the infraorbital border produced into an obtuse tooth. The basal antennal segment broader at base and its tip much short of infraorbital tooth.
Chelipeds are symmetrical, the wrist very swollen and bears two very obtuse teeth at inner angle, palm high but its upper border not at all crested, a shallow and indistinct groove extending along the upper outer surface; the fingers are obtusely pointed at tip. Ambulatory legs are also not at all crested. (T. Sakai, 1939: 480)

Type locality: Mauritius.
Range: Red Sea (Klunzinger, 1913); Zanzibar (Lenz, 1905); Mozambique; South Africa - Durban; Madagascar - Nosy Bé and Nosy Iranja (Serène, 1984); Iles Glorieuses (Serène, 1984); Mauritius (Adams & White, 1848, Bouvier, 1915b, Michel, 1964); Coëtivy Islands (Rathbun, 1911); India - Pondicherry (A. Milne Edwards, 1865); Japan - Hachijo-jima (Sakai, 1954, 1976), Northern Daito-jima (Sakai, 1939, 1976); Taiwan; shallow waters.

Atergatopsis signatus