Tetraloides heterodactyla   (Heller,  1861) (Crab)
Organism information awaits expert curation
Class: Malacostraca

Basal antennal segment extending to middle of inferior orbital tooth. Outer surface of larger cheliped palm entire. Propodi of fifth pereiopods lack setal fringe. Orbits large,oblique. Postorbital angle acute, projecting outward. Inferior orbital angle developed into triangular tooth, its apex strongly deflexed outward, in juveniles acute tip projects beyond frontal margin.

Carapace immediately behind front feebly granular. Anterolateral margins almost parallel in males, slightly constricted in front in adult females, divergent in juvenile specimens. Junction with posterolateral margin marked by acute tooth in juvenile specimen, adults lack lateral spines. Interorbital submedian lobes triangular, outer lobes very shallow. No hiatus between outer lobes and superior orbital angle. Evenly spaced minute denticles, successively larger laterally, edge front. External maxillipeds with exognath slender, tapered distally with a broad blunt triangular tooth at internal distal margin. Ischium of endopod nearly a parallelogram, proximal margin obliquely truncate, inner distal angle strongly produced, rounded; lateral margin subparallel, distal margin slightly excavate. Inner distal angle of merus markedly truncate, outer distal angle strongly produced and rounded. Chelipeds markedly unequal. Merus rounded, anterior margin granulate, crested. Anterior internal border of carpus granulate; few larger granules, nearly blunt spines, commonly on carpus of smaller chela. Menus of large chela massive, rounded, finely granulate. Rows of larger granules causing a serrulate lower margin. Dactyl and immovable finger bearing rudimentary teeth on proximal portion of cutting edge. Sometimes males having fingers with an elongate oval gape, meeting only at tips. Manus of smaller chela narrow, laterally compressed, cutting edges of fingers furnished with few shallow teeth, meeting throughout. Ambulatory meri laterally flattened, almost foliaceous, their upper margins cristate. Carpal and propodal articles wide. Lateral distal end of propodus near dactylar articulation armed with strong stout spines. Blunt, horny, hoof-tip, medially grooved. Inferior distal surface of dactyl decorated with chitinuous setae arranged in three discontinuous transverse bands. Superior distal surface just behind tip with several curved spinules.

Obligate symbionts of Acropora Corals.

Synonym (s)
Tetralia heterodactyla Heller, 1861a

Common Name (s)
Economic Importance and Threats

Habitat:  Reef Associated


• Lakshadweep INDIA
• Andaman and Nicobar Islands INDIA

Literature Source(s)
  • 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

Page last updated on:2010-11-22

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