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Phylum Arthropoda > Subphylum Crustacea > Class Malacostraca > Order Decapoda > Brachyurans > Family Xanthidae
Floral egg crab
Atergatis floridus

Family Xanthidae
updated Dec 12
if you learn only 3 things about them ...
These crabs are poisonous to eat! Their toxins are NOT destroyed by cooking.
They are generally secretive and slow-moving.
They are not venomous but it's best not to touch them.

Where seen? This round well-camouflaged crab is commonly seen on our Southern shores, among coral rubble or reefs. But it is usually not as numerous as the Red egg crab (Atergatis integeriimus). It is more active at night.

Features: Body width 8-10cm. Large oval body, smooth and brown with a fine network of lines in blotches in white, cream or yellow that forms a floral pattern. Males may have larger pincers. Juveniles are light brown with a white band around the edge of the body. Like most other Xanthid crabs, it is highly poisonous and should not be eaten.

What does it eat? Although it is described as a vegetarian, one was seen happily eating a fish. Like other Xanthid crabs, it is poisonous and should not be eaten.

Status and threats: This crab is listed as 'Vulnerable' on the Red List of threatened animals of Singapore.

Sentosa, May 04

A pair of mating egg crabs.
Cyrene Reef, Jul 10
Photo shared by James Koh on his blog.

A juvenile Brown egg crab.
Tuas, Nov 03

Eating a Brown-stripe wrasse.
Sentosa, Sep 04

Floral egg crabs on Singapore shores

Photos for free download from wildsingapore flickr

more photos of floral egg crabs on Singapore shores

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.
  • Gopalakrishnakone P., 1990. A Colour Guide to Dangerous Animals. Venom & Toxin Research Group, Faculty of Medicine, National University of Singapore. 156 pp.
  • Davison, G.W. H. and P. K. L. Ng and Ho Hua Chew, 2008. The Singapore Red Data Book: Threatened plants and animals of Singapore. Nature Society (Singapore). 285 pp.
  • Chuang, S. H., 1961. On Malayan Shores. Muwu Shosa, Singapore. 225 pp., plates 1-112.
  • Davison, G.W. H. and P. K. L. Ng and Ho Hua Chew, 2008. The Singapore Red Data Book: Threatened plants and animals of Singapore. Nature Society (Singapore). 285 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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