|Dardanus megistos wearing triton, at Iriomote Island, Japan|
These tropical reef-associated crabs occur in coral reef, lagoons, rocky platforms, sand and seagrass beds, from littoral and subtidal zones to deep waters, at depths up to 50 m. 
Dardanus megistos can reach a body length of about 20 cm (7.9 in). These large crabs have a bright red body with small white eyespots surrounded by black. Their bodies are covered with long erect coarse hairs of a dark red color. They have a pair of long white primary antennae or antennules, a pair of secondary antennae, stalked green brown eyes and three pairs of mouth appendages. The stalks of the eyes are reddish with a basal white spot. The soft, asymmetrical abdomen is spiral-shaped, useful in keeping in the shell, with a five-piece tail (telson and uropods). Like all decapod crustaceans, they have ten legs. The first pair of legs carries the pincers ( chelipeds). The left plier is bigger than the right one.
The white-spotted hermit crabs are gonochorics, the eggs are carried on the female's abdomen. They also are opportunistic omnivore, mainly feeding on small invertebrates (worms, molluscs, etc.) and they are also reported to feed on holothurians. Commonly these crabs perform a precopulatory courtship ritual. Usually the sperm transfer is indirect. They may live up to 30 years. These crustaceans usually inhabit a large shell of a gastropod, consequently only the cephalothorax and the first three pairs of legs are visible.
- Barnes, D.K.A. and R.J. Arnold 2001 Ecology of subtropical hermit crabs in S.W. Madagascar: cluster structure and function. Mar. Biol. 139:463-474.
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- Patsy McLaughlin (2009). Patsy McLaughlin (ed.). "Dardanus megistos (Herbst, 1804)". World Paguroidea database. World Register of Marine Species. Retrieved February 6, 2010.
- "Species Dardanus megistos (Herbst, 1804)". Department of the Environment, Water, Heritage and the Arts. February 23, 2009. Archived from the original on December 3, 2013. Retrieved February 6, 2010.
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