Masked Burrowing Crab

Gomeza bicornis

The Masked Burrowing Crab, part of the crustacean family Corystidae, is a reef-associated species found in the Indo-West Pacific region. This crab is known for its ability to inhabit sandy habitats, where it burrows and leaves its antennae at the surface. These antennae are crucial for detecting environmental cues while the rest of the body remains hidden beneath the sand. Divers may encounter this species at depths ranging from the surface to 50 meters, although most sightings occur shallower than 40 meters. The Masked Burrowing Crab is a member of the order Decapoda, which are primarily gonochoric, meaning individuals are distinctly male or female. Their mating behavior includes a precopulatory courtship ritual that relies on olfactory and tactile cues, followed by indirect sperm transfer. Divers observing the Masked Burrowing Crab should look for subtle signs of movement on the sandy bottom, as these crabs are adept at camouflaging themselves. They pose no threat to humans and are currently not evaluated for conservation status.