Gall crabs are sexually dimorphic, with males being much smaller than females.

[1][3] These crabs are most common in shallow waters where they live in association with stony corals, but they have also been recorded from mesophotic zones and deep waters.

[4][5] They likely feed on mucus secreted by their coral hosts, as well as various detritus.

Some species are thought to be filter feeders.

[1] Because crab size is related to gall size, it is likely that the crabs form the galls, rather than living randomly in a dwelling within a coral.