Trapezia tigrina   Eydoux & Souleyet,  1842 (Crab)
Organism information awaits expert curation
Class: Malacostraca

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Carapace wider, an acute external orbital angle and epibranchial teeth; the meral teeth of the cheliped is subject to variation, often the right and left arms of a specimen are strongly unequal. A tooth like pointed prominence decorates the antero-internal angle of the carpus. Red spots cover cream colored carapace and legs.

Carapace smooth, slightly convex, without definite regions. Antero-lateral margins slightly curved inwards in the direction of outer orbital spine, but inflated in the middle so that the margins are parallel along the proximal half. In younger specimens the carapace is quite as broad at the outer angles of the orbits as between the lateral teeth or even slightly divergent, but in larger specimens, especially gravid females, it is slightly contracted in front. Posterolateral margins convergent backwards from a distinct lateral epibranchial tooth which is juveniles always projects as a sharp spine, some adults retain that character. Front, four-lobed, projects beyond the orbits, over the antennules and bases of the antennae which are excluded from the orbits. The frontal submedian pair of lobes are triangular, separated from each other by a shallow V-shaped incision and from the outer pair of lobes by a wider, uneven sinus; both lobes of this outer pair are about twice as wide basally as each submedian lobe, and directed obliquely outwards, their edge sometimes finely denticulate. Apices of outer pair of frontal lobes not extending as far forward as the submedians. The internal angles of the orbits are rounded and less prominent than the front. The orbits, too shallow to conceal the eyes, are cut out of the antero-lateral angles of the carapace. The inferior inner orbital tooth in conical, incurved and rather prominent. The postorbital tooth is acute, often incurved. The antennae have the peduncular articles small, fitted in between the outer side of the slender antennular groove and the inner side of the inferior orbital angle. The third maxillipeds are subrectangular, with the exognath not quite extending to the distal angle of the endognath. The ischium of the endognath with the inner margin rounded. Inner lip of merus rounded, inner distal angle truncate and outer distal margin rounded. Chelipeds smooth, glabrous and considerably developed. Chelipeds subequal in females and young males, notiveably unequal in adult males. The meri project beyond males, noticeably unequal in adult males. The meri project beyond the lateral margins of the carapace; the distal margin is provided with one triangular tooth. Anterior margins armed with 5-7 small teeth, simple or serrulate, which increase in size distally. The shape and number of the meral teeth is subject to variation, often the right and left arms of a specimen are strongly unequal. Minute teeth, observed only under magnification, decorate the lower margin of the palm. Inner angle of carpus produced, covered with squamiform granules. A tooth-like pointed prominence decorates the antero-internal angle of the carpus. Fingers incurved, distally acute. Ambulatory legs slender, with segments slightly compressed. Dactyli sparsely pubescent and rather shorter than propodi. The distal end of the dactylus is curved and composed, on the upper surface, of several rounded ridges, blunted distally, thus giving the tip an appearance of a denticled rasp. Posterior margin in ambulatory dactyli with five parallel transverse rows of short, blunt spines and a cluster of stout setae at distal end. The shape and number of rows is of importance systematically.

Obligate symbionts of Pocillopora corals.

Synonym (s)
Cancer rufopunctatus Ruppell, 1830

Common Name (s)
Economic Importance and Threats

Habitat:  Reef Associated


• Lakshadweep INDIA
• Andaman and Nicobar Islands INDIA

Literature Source(s)
  • Jeyabaskaran, R; Wafar, S and Wafar, M (2002) CD on Brachyuran Crabs of West Coast, India Available at -
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Available at -

Page last updated on:2010-11-24

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