land crab

noun
any of several crabs, especially of the family Gecarcinidae, that live chiefly upon land, returning to the sea to breed.

Origin:
1630–40

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World English Dictionary
land crab
 
n
any of various crabs, esp of the tropical family Gecarcinidae, that are adapted to a partly terrestrial life

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

land crab

any crab of the family Gecarcinidae (order Decapoda of the class Crustacea), typically terrestrial, square-bodied crabs that only occasionally, as adults, return to the sea. They occur in tropical America, West Africa, and the Indo-Pacific region. All species feed on both animal and plant tissue. Cardisoma guanhumi, a land crab of Bermuda, the West Indies, and the southern United States, lives in fields, swamps, and mangrove thickets. Some penetrate inland as far as 8 km (about 5 miles). Adults weigh about 0.5 kg (18 ounces) and measure about 11 cm (4 inches) across the carapace, or back. Gecarcinus lateralis, occurring from Bermuda to Guyana, is 9 cm wide. Like Cardisoma, it may live a considerable distance from the ocean.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Traces of two hearths, seen as ash stains mixed with land crab claws and other food remains, were also discovered.
Ant birds keep guard over a bustling ant highway, and a land crab scuttles out of the way of our plodding feet.
Strangest of all, a small red land crab also raids the pitchers for food.
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