Trapezia ferruginea [Status Unaccepted]   Latreille,  1825 (Crab)
Organism information awaits expert curation
Class: Malacostraca

Image copyrights: FLMNH

Color (in life): Carapace and walking legs orange to brownish orange. Thin, light orange band often along anterior border of carapace, anterior and distal borders of merus of chelipeds and borders of third maxillipeds.
Eyes dark brown, almost black. Ventral portion of inner surface of chelipeds light orange or orange-yellow. Finger and dactylus of chelipeds dark brown to black.

Distinct spine at the junction of the anterolateral and posterolateral borders of the carapace. Lower border of hand cristate and entire. Frontal border rather undulate. The frontal teeth being not deeply separated. Outer surface of hand smooth and bald; no tranverse series of red spots on the carapace. Carapace and appendages uniformly yellowish or light brownish.

Anterolateral borders of carapace curved in fully grown individuals and nearly parallel to each other in juveniles but curving with increasing size. Epibranchial tooth as acute tooth or notch in juveniles and adults but may be absent in largest individuals. Postorbital angles acute in juveniles and obtuse in adults. Inner suborbital teeth showing similar development. Frontal border wide, arched and clearly cut into two round supraorbital angles and four lobes. Median lobes typically triangular but sometimes rounded. In juveniles and small adults four lobe and supraorbital angles ornamented with variable number of minute teeth, which decrease in number and become barely noticeable of disappear in larger individuals. Third maxillipeds subrectangular. Ischium of endognath smooth with scattered punctate but no granulation. Juveniles and small adults showing suture between second and third thoracic sternites (sternal suture 2/3). Suture absent in adults. Some with faint scar or suture remaining on one or on two opposite outer margins of sternite. Chelipeds massive, particularly in males, and almost always unequal. Merus of chelipeds armed with well-developed teeth that vary in size and number, often between right and left meri of individual. Teeth more acute in juveniles and small adults. Distal and proximal angles along anterior margin of carpus of juveniles and adults with two rounded, acute teeth. Short setae along outer margins of carpus and propodus. Short or moderately long tomentum sometimes present on proximal and distal joints of carpus or even on outer surface of carpus of large individuals. Upper margins of propodus rounded; lower margin cristate with few microscopic teeth. Fingers short and curved. Development of teeth on figures varying. Dactylus and immovable fingers of largest cheliped armed with large teeth in some; cutting edges or teeth on fingers of smaller cheliped. Merus of walking legs laterally flattened with cristate dorsal margin. Upper margins of carpus, propodus and dactylus with many slender, long setae. Some setae plumose. Distal end of dactylus curved with horny ridges at tip; inner (posterior) margin with eight to 10 thick, horny setae and, proximally, four to eight transversal rows of shorter setae. Transversal rows of setae decreasing in development from last pair of legs. First pleopod of male long and slender. Apex slender and symmetrical. Short spines along both distal surfaces; proximal plumose setae.

Obligate symbionts, found only in the corals of Acropora and Pocillopora corals.

Synonym (s)
Trapezia ferruginea Latreille, 1828

Common Name (s)
Economic Importance and Threats

Habitat:  Reef Associated


• Andaman and Nicobar Islands, Andaman Islands (Lat: 12.5) (Long: 92.75) INDIA
• Lakshadweep, Minicoy (Lat: 8.12) (Long: 73.3) INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• Andaman and Nicobar Islands INDIA
• Lakshadweep INDIA
• Lakshadweep Islands (Lat: 8.28) (Long: 72.16) INDIA (Record: 01/1987-03/1987)
• Lakshadweep Islands (Lat: 11.68) (Long: 73.68) INDIA (Record: 01/1987-03/1987)
• Tamil Nadu 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
  • Sankarankutty, C (1961) On some crabs (Decapoda, Brachyura) from the Laccadive Archipelago Journal of the Marine Biological Association of India Marine Biological Association of India 3(1-2) 120-136 Available at - NIO, RC, Kochi
  • Paulson, O (1961) Studies on Crustacea of the Red Sea The Israel Program for Scientific Translations 1-164 Available at - CMFRI, Kochi
  • 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 -
  • Florida Museum of Natural History Available at -
  • Rao, GS; Suseelan, C and Kathirvel, M (1989) Crustacean resources of the Lakshadweep islands Marine living resources of the union territory of Lakshadweep: An indicative survey with suggestions for development Bulletin of Central Marine Research Institute CMFRI 43 72-76 Available at -
  • Rao, GC (1991) Distribution of plants and animals on the rocky sea shores of Andaman and Nicobar Islands Journal of the Andaman Science Association Andaman Science Association, Port Blair 7(2) 30-42 Available at - NIO, Goa
  • 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

Page last updated on:2011-10-11

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