Name : Calappa lophos (Herbst, 1782)
Length of carapace about two thirds of its width, free margins of
clypeiform expansions cut into 6 teeth, Posterior border of carapace
beaded and bounded on either side by an indistinct tooth.
1782, Krabben Und Krebse, vol. V. 1, p. 201, pl. 13, fig.77
Haan 1837, Fauna Japonica, vol. V, p. 72, pl. 20, fig. 1.
1896, J. Asiatic Soc. Bengal, vol. 65(2), p. 144
1951, Bull. Central Ins. Travancore ii, p. 8
1957, Marine Crabs of Bombay State, p. 6
1976, Crabs of Japan and the Adjacent Seas, p. 129
and Ajmal khan 2000, Brachyuran Crabs of Gulf of Mannar, p.
47, pl. 32 b
Soft sandy substratum, 30-50 meters deep
Tranzania, Persian Gulf, India, Sri Lanka, Thailand, Celebes, China,
East and West Coast, Gulf of Mannar, Andaman & Nicobar islands.
Carapace smooth, except for a few lumps anteriorly and a few scattered
granules posteriorly. Its antero-lateral borders beaded and finely
festooned. Its posterior border beaded and bounded on either side
by a tooth. Clypeiform expansions nearly as broad as long. Outer part
of the pterygostomian regions densely hairy. Front bifid, its least
breadth equal to the breadth of the orbit, beyond the level of which
it does not project. Margin of the transverse wing-like expansion
of the distal end of the arm four lobed, the two anterior lobes each
with a spine. Upper surface of wrist and outer surface of palm nearly
smooth. Crest of palm deeply 6 or 7 toothed.
In the young specimens, the carapace is traversed longitudinally in
its anterior three-fourths, by 7 or 8 line of sharpish tubercles.