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Index of flora
Index of fauna
Kingdom Animale | Phylum Arthropoda | Subphylum Crustacea | Class Malacostrata
Swimming Crabs
Family Portunidae

Order Decapoda

These crabs are so named because their last pair of legs have been flattened into paddle-like structures. There are many species in sandy areas and the coral reef. Most are good swimmers, moving sideways rapidly with their pincers spread out.

Two genera are Thalamita and Charybdis, the former characterised by four teeth on the margin of the shell, the latter with five.

Thalamita is more common on reefs, especially the very vicious blood red species, T. spinimana. (Shell width 5-15cm).
Photo by Tan Bee Hong
Thalamita crenata

Thalamita spinimana
Shore environment
From A Guide to Seashore Life by Dr Leo W H Tan and Peter K L Ng
Published by the Singapore Science Centre and sponsored by BP

@Raffles Museum of Biodiversity Research and Singapore Science Centre