Carapace of Mud Crab (Scylla sp.)
Pulau Ubin, 15th November 2009

All Mud Crabs were once lumped under a single species, although further research indicates that there are actually four species, three of which are known to occur naturally in Singapore. These are the Orange Mud Crab (Scylla olivacea), the Green Mud Crab (Scylla paramamosain), and the Purple Mud Crab (Scylla tranquebarica). The Giant Mud Crab (Scylla serrata), although widely distributed throughout the region, and commonly imported for consumption, has not been confirmed to occur locally; any recent records in Singapore probably represent escapes or releases from captivity, rather than a naturally-occurring population.

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