Orange Mud Crab

Scylla olivacea

The Orange Mud Crab, known scientifically as Scylla olivacea, is a notable member of the mangrove crab family. It is commonly found in mangrove regions extending from Southeast Asia to Pakistan, and from Japan to northern Australia. This species is easily recognized by its brownish to brownish-green carapace, which sometimes appears orangish, and its distinctive orange to yellow claws. A key characteristic that sets it apart from other species in the Scylla genus is the blunted spines on the claws and rounded frontal lobe spines with shallow separations between the eyes. These crabs thrive in brackish, tropical environments, particularly in intertidal to subtidal zones and estuarine mangroves. They are a common sight in markets across Sundaic Southeast Asia and Thailand. The Orange Mud Crab engages in a unique mating behavior characterized by a precopulatory courtship ritual involving olfactory and tactile cues. This species is not currently evaluated by the IUCN Red List, CITES, or CMS. Divers encountering this species can expect to find them in mangrove areas, where they are harmless to humans.