Pinnotheres vicajii   Chhapgar,  1957 (Crab)
Organism information awaits expert curation
Class: Malacostraca

Dorsal view of male Pinnotheres vicajii with abdomen extended

Length of carapace: 4.0 mm
Breadth of carapace: 4.0 mm
Breadth of front: 1.1 mm
Length of carapace: 5.6 mm
Breadth of carapace: 6.4 mm
Breadth of front: 1.3 mm
Breadth of anterior border of carapace: 4.1 mm

Color: Color yellow, in the male the carapace is covered with minute black pigment spots.

Female: Body soft, carapace subquadrate, anterior angles pronounced but with rounded corners, no pigment spots.
Merus-ischium of external maxillipeds is a broad plate with the innwer (posterior) margin slightly concave and the antero-internal angle pronounced: prpodus elongate, broad and spatulate, it reaches farther than the inner angle of the merus. Dactylus minute, styliform, inserted at inner margin of propodus, just over-reaching the inner angle of the merus, and reaching to the end of the propodus.
third pair of walking legs the longest, last pair longer than the first; propodites with a few silky hairs distally; dactyli of the first two pairs aubequal in length, strongly hooked, those of the third and fourth pairs about twice as long as the first two, subequal, hairy and slender, regularly curved.
Abdomen of seven joints.
Male: Carapace smooth, well calcified, circular, without any trace of anterior angles, covered with minute, scattered pigment spots on the anterior half of the carapace up to a line joining the bases of the second pair of walking legs.
Merus-ischium and propodus of external maxillipeds similar to those of the female, except that the propodus is abruptly narrowed in the distal half. The dactylus does not even reach the antero-internal angle of the merus, as it does in the female. There is a brush of hairs at the tip of the last joint of the exognath of the external maxillipeds, but no hairs along the sides of this joint.
Third pair of walking legs the longest, the last pair shortest: inner borders of carpus and propodus of the second and third pairs of legs, as also all borders of the last pair fringed with silky hairs. A fringe of hair runs diagonally from the inner border of the proximal end of the carpus to the outer border of the distal end of the propodus of the second and third pair of legs. Dactyli of first three pairs of legs subequal, those of the last pair slightly shorter; all hairy.
Abdomen seven-jointed, narrow, no fringe of hair on its borders.

Both sexes were obtained from the bivalve Paphia malabarica at Bombay, each crab living separately in a shell.

This species is allied to Pinnotheres quadratus Rathbun in the pigmentation of the male carapace and the small size of the dactylus of the external maxillipeds, but differs from it mainly in the circular male carapace, covered only in the anterior half with minute pigment spots, and without any trace of anterior angles, hirsute nature of the dactyli of all the legs, and narrow abdomen.

Synonym (s)
Pinnotheres vicajii Chhapgar, 1955
Pinnotheres vicajii Chhapgar, 1957

Common Name (s)
Economic Importance and Threats



• West Coast INDIA
• Maharashtra, Mumbai INDIA

Literature Source(s)
  • Chhapgar, BF (1957) Marine crabs of Bombay state Contribution No. 1 of the Taraporevala Marine Biological Station Marine Biological Station, Department of fisheries, Bombay 89 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Jeyabaskaran, R; Wafar, S and Wafar, M (2002) CD on Brachyuran Crabs of West Coast, India Available at -

Page last updated on:2010-11-11

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