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terrestrial crab
A number of lineages of crabs have evolved to live predominantly on land. Examples of terrestrial crabs are found in the families Gecarcinidae and Gecarcinucidae, as well as in selected genera from other families, such as ''Sesarma'', although the term "land crab" is often used to mean solely the family Gecarcinidae.〔
==Terrestriality and migration==
There is no clear distinction between "terrestrial", "semi-terrestrial", and "aquatic" crabs. Rather, there is a continuum of terrestriality displayed among the true crabs, although even the most land-adapted crabs must still return to water to release their eggs. Some species of terrestrial crabs can be found many kilometres from the sea, but have to complete annual migrations to the sea.〔 For example, following the Indian Ocean monsoon, the Christmas Island red crab (''Gecarcoidea natalis'') migrates ''フランス語:en masse'', forming a "living carpet" of crabs. The crabs can travel up to in a day, and up to in total.!
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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