This colourful and swift crab is sometimes seen on our some of our
rocky shores. Small groups may clamber noisily among rocks on seawalls
or natural rocks. Sometimes, it may also be seen on the reef flats
near the rocky shore. It is more active at night and seldom seen during
daylight. Very shy, it disappears instantly into crevices at the slightest
sign of danger.
Features: 5-6cm. Body circular,
dark with a pattern of light spots in bands at the lower portion of
the body. Short small flattened pincers. Very long walking legs tipped
with pointy claws. With these legs, the crab clings tightly so it
doesn't get washed away in the waves, and can scramble quickly among
slippery rocks. Colours seen range from reddish to bluish and greenish.
Males have larger pincers than the females.
Sometimes mistaken with the Pimply
Sally-light-foot crab (Plagusia squamosa) which has a more
squarish less flat more bumpy body.
What does it eat? It is a scavenger
and also eats seaweeds. It has relatively small pincers that work
like scissors to snip and scrape off edible titbits.
Kusu Island, Apr 05
East Coast, May 11
at top left corner, crab in bottom right.
moulted crab (blue) with moult (orange).
Sisters Islands, Jul 04
Flattened against an encrusted surface.
Kusu Island, Sep 10
crabs on Singapore shores
photos of sally-light-foot crabs on Singapore shores
- Ng, Peter
K. L. and Daniele Guinot and Peter J. F. Davie, 2008. Systema
Brachyurorum: Part 1. An annotated checklist of extant Brachyuran
crabs of the world. The Raffles Bulletin of Zoology. Supplement
No. 17, 31 Jan 2008. 286 pp. (Online
PDF on the Raffles Bulletin of Zoology website).
- 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.