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Phylum Arthropoda > Subphylum Crustacea > Class Malacostraca > Order Decapoda > Brachyurans > Family Xanthidae
Rock crab
Leptodius sp.*

Family Xanthidae
updated Oct 2016
Where seen? This large crab with typical spoon-tipped pincers is sometimes seen in rocky or rubbly areas on our Southern shores.

Features: Body width 8-10cm. Body oval, rather flat, with 4-5 blunt teeth on the edges of the shell. Colours and patterns in a wide variety; basically brown or grey, sometimes with dark patches or mottled. Pincers not very long, somewhat squat with bumps on the 'elbows' and black spoon-shaped tips. These are probably used to scrape off algae. The walking legs are fringed with long hairs and end in pointed tips.

Sometimes confused with Smooth spooner crab (Etisus laevimanus) which have pincers that are longer, more slender and smooth (without bumps).


Pincers with bumpy elbows.
St. John's Island, Sep 09


Pulau Tekukor, May 10
Photo shared by James Koh on his blog.


Rock crabs on Singapore shores

Photos of Rock crabs for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Pulau Senang, Jun 10
Photo shared by Marcus Ng on flickr.

Acknowledgements
With grateful thanks to Ondrej Radosta for identifying the species of the crabs on this page.

Links

References
  • Lim, S., P. Ng, L. Tan, & W. Y. Chin, 1994. Rhythm of the Sea: The Life and Times of Labrador Beach. Division of Biology, School of Science, Nanyang Technological University & Department of Zoology, the National University of Singapore. 160 pp.
  • Jones Diana S. and Gary J. Morgan, 2002. A Field Guide to Crustaceans of Australian Waters. Reed New Holland. 224 pp.
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