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Phylum Arthropoda > Subphylum Crustacea > Class Malacostraca > Order Decapoda > Brachyurans > Family Portunidae
Orange-clawed swimming crab
Charybdis anisodon*
Family Portunidae
updated Jun 2020
Where seen? This swimming crab is sometimes seen, among seagrasses on our Northern shores.

Features: Body width 5-7cm. Body somewhat fan-shaped with 6 spines on the sides - 4 small rounded ones and the last two sharper and longer. The eyes not very far apart. Between the eyes there are 8 small rounded lobes. Last pair of legs are paddle-shaped and rotate like boat propellers, so the crab swims well in all directions. It is a fully marine crab and cannot live long out of water. Body and legs olive green. Claws olive green on the outside, orange on the inside and towards the pincers which has white tips

Pasir Ris, Mar 15

6 spines on the body side.

Pasir Ris, Mar 15

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Orange-clawed swimming crabs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Changi, Jun 20
Photo shared by Marcus Ng on facebook.

Changi West, Sep 20
Photo shared by Vincent Choo on facebook.

With grateful thanks to Marcus Ng for identifying this crab.

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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