
Grapsidae is a family of crabs known variously as marsh crabs, shore crabs or talon crabs. It is not confirmed that the family forms a monophyletic group and some taxa may belong in other families. They are found along the shore among rocks, in estuaries, marshes, and in some cases pelagic among drifting seaweeds and flotsam. ==Genera== A number o...
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http://en.wikipedia.org/wiki/Grapsidae

Grapsidae is a large family of crabs found all over the world with a quadrilateral carapace.
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http://www.probertencyclopaedia.com/browse/BGA.HTM
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