Hyastenus diacanthus   (De Haan,  1839) (Crab)
Organism information awaits expert curation
Class: Malacostraca

Image copyrights: microseashell.com

Body and legs densely tomentose, often much encrusted with sponges etc. Carapace pyriform, with the regions strongly convex, well defined. An acuminate tubercle on the middle line of gastric region. Near the hinder limit of either branchial region a horizontally projecting lateral epibranchial spine. The rostrum consists of two more or less divergent horns, the length of which in the adult male is from half to nearly two-thirds that of the carapace proper, but in the female is less. The chelipeds in the male are stouter than any of the other legs, and are equal in length to the carapace plus half the rostrum. In the female and young, male the chelipeds are rather more slender than any of the other legs. The second pair of trunk-legs are nearly twice the length of the male chelipeds.

The crabs are usually masked with numerous sponges or hydroid animals.

Synonym (s)
Hyastenus diacanthus A. Milne-Edwards, 1872
Hyastenus diacanthus A. O. Walkar, 1890
Hyastenus diacanthus Cano, 1889
Hyastenus diacanthus de Man, 1887
Hyastenus diacanthus Haswell, 1879
Hyastenus diacanthus Mary Rathbun, 1893
Hyastenus diacanthus Ortmann, 1893
Naxia diacantha Brocchi, 1875
Naxia diacantha C. W. S. Aurivillius, 1988
Naxia diacantha Stimpson, 1857
Pisa (Naxia) diacantha De Haan, 1839
Pisa (Naxia) diacantha De Haan, 1839
Pisa (Naxia) diacanthus De Haan, 1839

Common Name (s)
Economic Importance and Threats

Habitat:  Demersal, Sandy, Coastal


• Andhra Pradesh, Off Visakhapatnam Coast (Lat: 17.7) (Long: 83.3) INDIA
• Andaman and Nicobar Islands, Andaman Islands (Lat: 10) (Long: 93) INDIA
• Andaman and Nicobar Islands INDIA
• Lakshadweep INDIA
• West Bengal (Lat: 21.16) (Long: 85.83) INDIA
• West Bengal (Lat: 21.63) (Long: 89.83) INDIA
• West Bengal, South 24 Parganas INDIA

Literature Source(s)
  • 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
  • Sarma, ALN (1977) The phytal fauna of Sargassum off Visakhapatnam coast Journal of the Marine Biological Association of India Marine Biological Association of India, Ernakulam, Cochin-682 011, India 16(3) 741-755 Available at - NIO, RC, Kochi
  • Griffin, DJG (1974) Spider Crabs (Crustacea: Brachyura: Majidae) from the International Indian Ocean Expedition, 1963-1964 Smithsonian Contributions to Zoology Smithsonian Institution Press, Washington, D.C. 182 12785 Available at - NIO, RC Kochi
  • Jeyabaskaran, R; Wafar, S and Wafar, M (2002) CD on Brachyuran Crabs of West Coast, India Available at - http://www.nio.org/Biology/brachyuran/index.html
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • microseashell.com Available at - http://microseashell.com/index.htm
  • Sealifebase Available at - http://www.sealifebase.org/
  • Deb, M and Rao, GC (1993) A check-list of the brachyuran crabs (Crustacea: Decapoda)of Bay islands Journal Of The Andaman Science Association Andaman Science association, Port Blair 8(1-2) 25-34 Available at - NIO, Goa
  • Roy, MKD and Nandi, NC (2008) Checklist and distribution of Brachyuran crabs of West Bengal, India Journal of Environment and Sociobiology Social Environmental and Biological Association, Kolkata, India 5(2) 191-214 Available at - NIO,Goa
  • Roy, MK (2010) Diversity and Distribution of Crustacea Fauna in wetlands of West Bengal Journal of Environment and Sociobiology Social Environmental and Biological Association, Kolkata, India 7(2) 147-187 Available at - NIO,Goa

Page last updated on:2011-11-04

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