Triangular fiddler crabs are very tiny. They have rather thick eye stalks, and two-thirds of their backs are covered with pure white or brown dots. The rest are sheer black. In fact, brown and white dots are their greatest feature. Such can also be found on their legs.
Triangular fiddler crabs live under mangrove trees, on oyster-shell and reef-rock muddy beaches, and among pebbles and mud.