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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, [1] although the term "land crab" is often used to mean solely the family Gecarcinidae. [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
Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are a part of the subphylum Crustacea (/ k r ə ˈ s t eɪ ʃ ə /), a large, diverse group of mainly aquatic arthropods including decapods (shrimps, prawns, crabs, lobsters and crayfish), seed shrimp, branchiopods, fish lice, krill, remipedes, isopods ...
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Malacostraca is the second largest of the six classes of pancrustaceans behind insects, containing about 40,000 living species, divided among 16 orders.Its members, the malacostracans, display a great diversity of body forms and include crabs, lobsters, spiny lobsters, crayfish, shrimp, krill, prawns, woodlice, amphipods, mantis shrimp, tongue-eating lice and many other less familiar animals.
Hermit crabs can be informally divided into two groups: aquatic hermit crabs and terrestrial hermit crabs. [17] The land hermit crabs belong to the family Coenobitidae. They spend most of their life on land in tropical areas, though they require access to water to keep their gills damp or wet to survive and to reproduce.
Small, colorful, and a lover of habitats with sandy substrates, Red-clawed Crabs are some of the best aquarium pets that aren’t fish. Also known as Mangrove Crabs or Red Crabs, these clawed ...
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.