Mithraculus sculptus is a small crab with a carapace longer than it is wide and large chelae (claws).

The carapace is flat, shiny and green, finely sculpted, with whitish material adhering to the projections.

Its range extends from the Bahamas and southern Florida to the northern part of Brazil at depths down to about 54 metres (177 ft).

[5] It is tolerant of both high and low temperatures and is capable of withstanding strong currents as it can use its legs to cling on to the substrate.

[5] Research has shown that it can be used to control excessive growth of bubble algae in aquaria, but best results are found when its diet is supplemented with mysids but not with pelleted food.