Red Sea Ghost Crab

Overview

The Red Sea ghost crab (Ocypode saratan) is a semi-terrestrial crustacean endemic to the Red Sea region. These crabs are primarily nocturnal and are well-known for their ability to thrive in the challenging, shifting environments of sandy intertidal zones.

Distribution & habitat

This species is endemic to the Red Sea. They inhabit sandy beaches, typically digging deep burrows in the supralittoral zone—the area above the high tide line that remains moist from wave splash but is not regularly submerged. These burrows provide essential shelter from environmental extremes and predators.

Appearance

Like other members of the Ocypode genus, the Red Sea ghost crab possesses a box-like, squarish body and elongated eyestalks. Both males and females have unequally sized claws. Interestingly, their coloration can vary based on their handedness; research indicates that right-clawed individuals often exhibit lighter, sand-like yellow tones, while left-clawed crabs may display darker brown or purple hues, aiding in camouflage against their background.

Biology & behavior

These crabs are highly adapted for life on land, returning to the sea primarily to wet their gills or release larvae. They are social animals that communicate through visual signals, chemical cues, and acoustic sounds produced by rubbing their claws together. During the breeding season, males are famous for constructing distinct sand pyramids near their burrow entrances to attract females. They are also known for their speed, which helps them navigate the beach and evade threats.

Feeding

As generalist scavengers and predators, they forage at dusk and during the night. Their diet consists of detritus found on the beach, as well as small animals such as snails.