Thalamita prymna
Dactylus of fifth pereiopod paddle shaped. Fontal margin cut into six lobes. Distant between the external angles of the eye orbits is not much less than the width of the carapace. Basal antennal segment broad with two fused spines. In adults the antennal flagellum is excluded from the orbit of the eye. Anterolateral margin of carapace with five teeth, the fourth tooth is the smallest. Carpus of cheliped with four spines.
Vernacular name: Two-spot swimming crab.
This species is characterised by its smooth green carapace, which often has two large black spots. Like other swimming crabs, they are predators, feeding on fish and other animals.
Order Decapoda Latreille, 1802
Infraorder Brachyura Latreille, 1802
Section Eubrachyura de Saint Laurent, 1980
Subsection Heterotremata Guinot, 1977
Superfamily Portunoidea Rafinesque, 1815
Family Portunidae Rafinesque, 1815
Subfamily Thalamitinae Paulson, 1875
Thalamita prymna (Herbst, 1803)
Red Sea, east coast of Africa, Madagascar Mauritius, Arabian Gulf, Pakistan, India, Sri Lanka, Andaman Is., Nicobar Is., Burma (Mergui Archipelago), Thailand, Malaysia, Singapore, Indonesia, China (Hong Kong) Japan and Australia. Records from outside this region may require verification.
Rocky coast, lower shore to 30m.