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Ixa cylindrus

Scientific Name:-
Ixa cylindrus

Common Name:-
Purse Crab

Malayalam Name:-
Purse Njandu

Category:-
Crabs

Status:-
Not evaluated


Description:-

Small sized specimens with very slender chelipeds and appendages. Carapace rhomboidal with cylindrical strong spine at the middle of the lateral margin, abruptly tapering at tip and covered with vesiculous granules. Between the granular portion the carapace smooth and polished. Body granulated both on the dorsal and ventral side. Deep channels or grooves present on carapace, separating gastric, hepatic, branchial and cardiac regions. Hepatic and protogastric regions separated from several median regions by a broad, deep longitudinal groove, which extends from the middle of the antero-lateral margin to the lateral of the intestinal region. Branched shallow groove presnt between hepatic and protogastric regions; another groove between cardiac and intestinal regions. Huge cylindrical sausage-shaped processes present on either side of the carapace between the junction of antero-lateral and postero-lateral borders. The antero-lateral margin concave at the middle portion, while postero-lateral margin almost straight. A rounded protuberance present on either side in the posterior margin, above which is present another large median protuberance. Buccal frame distinctly triangular. Buccal cavern can be clearly seen from antero-dorsal view. Abdomen granulated marginally both in males and females. The dactyli of pereiopods narrowly lanceolate. Outer orbital tooth projecting beyond front. The frontal region in the middle part bears a V – shaped notch and divided into two blunt teeth. Dorsal border of orbit with 2 sutures. Antero-lateral margin concave at the middle. Postero-lateral margin almost straight. Posterior margin with a rounded protuberance on each side. Chelipeds and ambulatory legs slender and smooth. Fingers shorter than palm and very slender; inner side finely spinulated. In live condition, the body is maroon in colour.

Threats:-

Not recorded

Remark:-

Bijukumar et al. (2007) and Sushilkumar (2013) recorded it from the trawl by-catch along Kerala coast.

Habitat:-

Muddy and Sandy.

Synonyms:-

Cancer cylindrus Fabricius, 1777; Ixa canaliculata Leach, 1817; Ixa cylindricus (Fabricius, 1777); Cancer cylindrus Herbst, 1783; Leucosia cylindrus Weber, 1795; Ixa cylindrus Leach, 1815b; Alcock, 1896; Nobili, 1903c; Ihle, 1918; Chopra, 1933a; Shen, 1940a; Lin, 1949; Holthuis & Gottlieb, 1956; Michel, 1964; Shen & Dai, 1964; Dai et al., 1986; Dai & Yang, 1991; Sakai K., 1999; Ixa cylindra Serène & Lohavanijaya,1973.

References:-

Biju Kumar, A., M. Sushil Kumar., S.M. Raffi and S. Ajmal Khan (2007). Diversity of brachyuran crabs associated with trawl by-catch in Kerala coast, India. Ind. J. Fish. 54 (3): 283-290.
Sushilkumar, M. (2013). Diversity and proximate composition of brachyuran crabs in the trawl by-catch of Kerala coast. PhD Thesis submitted to University of Kerala, India.




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