Actaea hirsutissima   (Ruppell,  1830) (Crab)
Organism information awaits expert curation
Class: Malacostraca

Image copyrights: Government of India

Size: Width 16 mm; length 11 mm

Broadly oval, medium sized crab, moderately convex in both the directions. The entire carapace is divided into convex regional and sub-regional lobules by deep, smooth, wide grooves. Surface of these lobules are covered with small granules and scattered, short, dark, stiff hairs. The lobule 2M entirely divided into two, the inner one of these is continuous with 1M forward, 3M is divided into three lobules, 4M is narrow; 1P is roughly heart-shaped; lobules 1L-6L are all very distinct. Textural pattern of carapace is very clear in adults. Frontal lobes rounded and deflexed, outer corners of each lobe prominent.
Antero-lateral sides long, convex, four lobed, other than outer orbital corner, first lobe low, small, last one smallest, 3rd one broadest. Outer surfaces of wrists of chelipeds dimpled, granular and hairy, of palm dimpled on outer surface, two-three very distinct, granular and hairy ridges present on the middle of palm, lower outer part is sharply granular; the rows of granules continued upto two thirds of the fingers. Only in very old males almost entire palms are dark brown in color, tips are white and blunt pointed. Base of dactylus is also white, but in youngs these fingers are not brown, but white. Leg joints thickly hairy, all the short, stout, carpal and propodal joints are rather dimpled; under surface of carapace is rough and with a thick coat of hairs and furs. Anterior male pleopod is a long, narrow, straight process, apex conical, bluntly ended and directed outwards; a cluster of long, simple setae present on inner subapical area, outer sides of this process is armed with scattered spinules all over.

Synonym (s)
Actaea hirsutissima Alcock, 1898
Actaeodes hirsutissimus Guinot, 1971
Xantho hirsutissima Ruppell, 1830

Common Name (s)
Economic Importance and Threats



• Andaman and Nicobar Islands, Andaman Islands (Lat: 12.5) (Long: 92.75) INDIA
• Andaman and Nicobar Islands, Andaman INDIA

Literature Source(s)
  • Tikadar, BK; Daniel, A and Subbarao, NV (1986) Sea shore animals of Andaman and Nicobar Islands The Director, ZSI, Kolkatta 188 Available at - ZSI, Pune
  • Alcock, A (1968) Materials for a carcinological fauna of India the Brachyura Oxyrhyncha The Baptist Mission Press 1 1-456 Available at - Pune University, Pune
  • Paulson, O (1961) Studies on Crustacea of the Red Sea The Israel Program for Scientific Translations 1-164 Available at - CMFRI, Kochi
  • Deb, M (1989) Contribution to the study of Xanthidae: Actaeinae (Decapoda: Crustacea) of India Records of the Zoological Survey of India. Occasional Paper No. 117 ZSI, Calcutta 59 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -

Page last updated on:2010-08-17

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