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The Journal of the Royal Institute of Thailand Volume IV - 2012 68  Mangrove Crabs There are approximately 30 species of crabs found in mangroves as recorded by Naiyanetr (1985). A majority of crabs belong to the four predominant families, Grapsidae, Ocypodidae, Portunidae and Gecarcinidae. The most common and important species are grapsis crabs ( Sesamar spp) and fi ddler crabs ( Uca spp). Many crabs in mangroves have attractive colours, in particular the fi ddler crabs ( Uca rosea , Uca vocans and Uca forcipata ). The mangrove mud crab, Scylla serrata is the largest edible crab and is of commercial importance. The most common and important species of mangrove crabs are shown in Figure 11. Sesamar spp Scylla serrata Uca rosea Figure 11: Common and important species of mangrove crabs Mangrove Molluscs Numerous molluscs are found in mangroves. The univalves, Nerita spp, Littorina spp and Ellobium spp are common and abundant. Other species in the univalve group are Cerithidea spp, Cassidula aurisfelis , Elysia viridis and Monodonta labio . Bivalves are also common and are often of high commercial value. These are oyster (Crassostrea commercialis) , mangrove mussels, mangrove cockles ( Andara sp) and a number of species of mangrove clams. Bivalves which feed on rotten stems and dead mangrove wood, particularly the Teredo spp are also found but in small numbers. Oyster, clam and cockle as shown in Figure 12 are common and commercial species in mangroves. Mangroves … Coastal Treasure of Thailand