Charybdis feriatus

Family
Subfamily
   Genus
Portunidae Rafinesque,1815
Thalamitinae Paulson, 1875
Charybdis


Species Name : Charybdis feriatus (Linnaeus, 1758)

Identification Key

First tooth of anterolateral borders obliquely truncate on outer border; palm with 4 sharp spine in all . Anterolateral teeth broad at base, first anterior lobe bifid; 3 spine on anterior borders of arm; a cross on carapace.

Synonymy

Cancer feriatus Linnaeus 1758, Syst. Nat. ed, vol. 10, p. 627.
Charybdis (Goniosoma) crucifera Alcock 1899, J. Asiatic Soc. Bengal, vol. 68(1), p. 51.
Pillai 1951, Bull. Central Inst. Travancore, vol. 2, p. 22.

Chhapgar1957, Marine Crabs of Bombay coast, p. 20.
Charybdis (Charybdis) cruciata Leene 1938, Siboga Exped. Monogr., 39c, p. 24.
Charybdis (Charybdis) feriata Sakai 1976, Crabs of Japan and Adjacent Seas, p. 357.
Jeyabaskaran and Ajmal Khan 2000, Brachyuran Crabs of Gulf of Mannar, p.53, pl. 39 a.
Charybdis feriatus Lee and Tung 2000, Active intertidal animals of Tainan coastline Crabs, p. 69.

Habitat

Rocks, stones, Sandy and Muddy substratum.

Distribution

East Coast of Africa, Madagascar, India, Taiwan, china, Japan & Australia.

India

East and West Coast, Gulf of Mannar, Andaman and Nicobar islands.

Description

Carapace not distinctly pilose, about two-thirds as long as broad, slightly convex, nearly smooth to the naked eye, the regions ill-defined. A finely granular curved line cross the anterior part of the gastric region; these are the only ridges on the carapace, and they become faint with age. The front is rather deeply cut into six teeth prominent regular blunt pointed teeth, not including the inner supra-orbital angles, none of which project much beyond the others. The antero-lateral borders are cut into six teeth including the outer orbital angles, of which the first is truncated and notched or bifid, the last is almost spine like but is little more salient than the others, while the other four are broad anteriorly-acuminate lobes. The chelipeds are nearly 2½ times the length of the carapace except for definitely placed costae and spines are smooth; the hands are a little unequal in size. The arm has three enlarged spines on the anterior(inner) border and a spinule at the far end of the inferior border, but the posterior border is unarmed.The wrist has the inner angle strongly spiniform and has three spinules and some smooth ridges on the outer surface. In both hands the fingers are strongly toothed, are as long as their palm. In the last pair of legs the merus is about three-fourths as long as broad and has a spine at far end of the posterior border. In the male the 6th tergum is much broader than long and has curved and gradually convergent sides.