Wiktionary
n. Any of several burrowing crabs, of the genus (l mul Ocypode), found along sandy shores.
Wikipedia
Ghost crabs are semiterrestrial crabs of the subfamily Ocypodinae. They are common shore crabs in tropical and subtropical regions throughout the world, inhabiting deep burrows in the intertidal zone. They are generalist scavengers and predators of small animals. The name "ghost crab" derives from their nocturnality and their generally pale coloration. They are also sometimes called sand crabs, though the name refers to various other crabs that do not belong to the subfamily.
Characteristics of the subfamily include one claw being larger than the other, thick and elongated eyestalks, and a box-like body. The differences in claw sizes, however, are not as marked as in male fiddler crabs. The subfamily includes 22 species in two genera.
Usage examples of "ghost crab".
He picked up everything within fifty feet of the shanty and chased off a ghost crab, smoothing over the delicate slashes its legs made in the sand.
Before the nurse could ring, or reach for medication, the first coarse bristles of Mason's revenge brushed his pale and seeking, ghost crab of a hand, and began to calm him.