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Some species of terrestrial crabs can be found many kilometres from the sea, but have to complete annual migrations to the sea. [3] For example, following the Indian Ocean monsoon , the Christmas Island red crab ( Gecarcoidea natalis ) migrates en masse , forming a "living carpet" of crabs.
The Gecarcinidae, the land crabs, are a family of true crabs that are adapted for terrestrial existence. Similar to all other crabs, land crabs possess a series of gills. In addition, the part of the carapace covering the gills is inflated and equipped with blood vessels. These organs extract oxygen from the air, analogous to the vertebrate lungs.
Gecarcinus ruricola is a species of terrestrial crab. It is the most terrestrial of the Caribbean land crabs, [3] and is found from western Cuba across the Antilles as far east as Barbados. Common names for G. ruricola include the purple land crab, [1] black land crab, [3] red land crab, [4] and zombie crab. [5]
Johngarthia lagostoma is a species of terrestrial crab that lives on Ascension Island and three other islands in the South Atlantic.It grows to a carapace width of 110 mm (4.3 in) on Ascension Island, where it is the largest native land animal. [2]
Crab (Pachygrapsus marmoratus) on Istrian coast, Adriatic Sea. Crabs attract a mate through chemical , visual, acoustic, or vibratory means. Pheromones are used by most fully aquatic crabs, while terrestrial and semiterrestrial crabs often use visual signals, such as fiddler crab males waving
Gecarcoidea is a genus of terrestrial crabs. The crabs live in forests but must come to the coast to breed. When it is dry in the summer the crabs are inactive, but when it is the wet season they are ready to migrate. Two species are recognised: [1]
Coenobita brevimanus is a species of terrestrial hermit crab belonging to the family Coenobitidae, which is composed of coastal living terrestrial hermit crabs. From there it belongs to the genus Coenobita , one of two genera split from the family, which contains sixteen species.
Cardisoma carnifex is a species of terrestrial crab found in coastal regions from the east coast of Africa and the Red Sea across the Indo-Pacific to the Line Islands and the Tuamotu Archipelago. [2] The range includes parts of northern Australia and the Cocos (Keeling) Islands .