rock crab

Short definition from Wiktionary

Noun

1. 1
   Any of several kinds of crabs often found on rocky coasts, especially: Hemigrapsus sexdentatus, a large-eyed marine crab found off the coast of New Zealand, the common rock crab
2. 2
   Any of several kinds of crabs often found on rocky coasts, especially: Cancer irroratus, the Atlantic rock crab, a crab with large marginal teeth, found along the Atlantic coast of North America
3. 3
   Any of several kinds of crabs often found on rocky coasts, especially: Romaleon antennarium, the Pacific rock crab of parts of the Pacific coast of North America.
4. 4
   Any of several kinds of crabs often found on rocky coasts, especially: A red rock crab.