Doclea muricata   (Herbst,  1788) (Crab)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Malacostraca
Order:Decapoda
Family:Epialtidae

Description
No spinules on the upper margin. In the male, spines or tubercles on the fourth thoracie somite. Rostrum long, reaching beyond the spines of the epistome on the anterolateral angle of the buccal frame. 8 or 9 median tubercles or spines, of which two are intestinal spines. Intestinal spine separate. Ambulatory legs without quadrangular pile. Chelace not keeled at the upper and lower border. Pterygostomial canal absent. Abdominal segments 4, 5 and 6 m both the male and female coalesced. Only one hepatic tubercle present.

The carapace is semi-globular. The rostrum is incised in the middle for 2 mm at the utmost. Between the incision and the pair of submedian tubercles anterior of the median line the rostrum is partly grooved. In adults the tips of the rostrum are directed straight forward. There is a narrow incision between the orbital margin and the postorbital spine. The outer edge of the postorbital spine is a bit convex, almost straight. In its median line the carapace carries eight tubercles or spines, of which the fourth and the last are most prominent. The first four tubercles are placed in the mesogastric region, the fifth in the urogastric, the sixth in the cardiac and the seventh and eighth are as the intestinal region, the eighth directed backward. The sixth median tubercle followed by a small convexity. In the posterior part of the frontal region, just the anterior median tubercle, there is a pair of submedian tubercles. In either protogastric region a longitudinal row of four tubercles are present, the two rows diverging posteriorly. The first of the four tubercles lies at the same level as the second median tubercle. The last tubercle of the row is largest and placed at a level between the third and fourth median tubercle.

To the outside, at the same level as the first submedian tubercle, there is another tubercle. The metagatric region show a small tubercle at either end of the anterior margin. The hepatic region carapaces only one tubercle. Either inner anterior part of the branchial region has thirteen tubercles forming three rows of respectively 5, 4 and 4 tubercles. The first two (outer) rows of the branchial region curve towards the last anterolateral spine; the third (inner) row starts in the anterior part and curves past the last anterolateral spine. The second and third tubercle of latter row is placed next to each other. The third branchial row lies in a direct line with the protogastric row. The anterolateral border of the carapace is armed with four tubercles or spines. The first is more prominent than the second and third, which are of equal size and the fourth is the most prominent. A tubercle up to one third as long as the first anterolateral spine, is sometimes placed just before the anterolateral spine. The posterior spine of the basal antennal segment is smaller than the anterior.

In the adult male the chelae are swollen and are more than three quarters as long as the carapace. In the female the chelae are half as long as the carapace. The ambulatory legs of the first pair have 2-2½ times the length of the carapace. The ambulatory legs are long and slender and the dense pile extends from the base to the proximal part of the dactylus. In the male the abdominal segments 4, 5 and 6 are coalesced. The second abdominal segment has a low median prominence. In the female the abdominal segments 4, 5 and 6 are also coalesced. The second abdominal segment has a low median prominence, while the third segment has additional pronounced transverse ridges on either side of the median line. In the male there are two strong submedian spines on the fourth thoracic somite, just before the seventh abdominal segment when the abdomen is in the normal position against the thorax. The first pleopod of the male, when fully mature, is well chitinized and triangular and transverse section. It is smooth, slightly bent and tapers gradually to a rather sharp points. A row of small hairs are present at the inner and outer border of the appendage.


Synonym (s)
Cancer muricata Herbst, 1790
Cancer muricatus Fabricius, 1787
Doclea hybridoidea Bleeker, 1856
Inachus hybridus Fabricius, 1798

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Coastal

Biogeography


• Maharashtra INDIA
• East Coast, Coromandel INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• Lakshadweep INDIA
• Andaman and Nicobar Islands INDIA
• Tamil Nadu, Chennai Coast INDIA
• Tamil Nadu 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)
  • Kensley, B (1981) On the Zoogeography of Southern Afrian Decapod Crustacea, with a distributional checklist of the species Smithsonian Contributions to Zoology Smithsonian Institution Press, Washington, D.C. 338 23377 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
  • Dr. Ramesh, R; Dr. Nammalwar, P and Dr. Gowri, VS (2008) Database on coastal information of Tamil Nadu Report Submitted to Environmental Information System (ENVIS) Centre, Department of Environment, Government of Tamil Nadu Institute for Ocean Management, Anna University, Chennai, Tamil Nadu. Available at - http://tnenvis.nic.in/PDF/coastal%20data.pdf
  • Roy, MKD and Nandi NC (2007) Brachyuran diversity in coastal ecosystems of Tamil Nadu Journal of Environment and Sociobiology Social Environmental and Biological Association, Kolkata, India 4(2) 169-192 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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