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Description. Gecarcinus quadratus, a land crab from Central America. Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin. [4][5] Behind their pair of chelae (claws) are six walking legs and then two swimming legs.
Crabs are crustaceans and related to lobsters and shrimps. There are almost 5,000 different species of crabs, about 4,500 are true crabs, plus around 500 are hermit crabs (hermit crabs do not have a very hard shell and use other animals old shells for protection).
crab, any short-tailed member of the crustacean order Decapoda (phylum Arthropoda)—especially the brachyurans (infraorder Brachyura), or true crabs, but also other forms such as the anomurans (suborder Anomura), which include the hermit crabs.
Description. Crabs exhibit a wide range of physical appearances, sizes, and colors, adapted to their diverse habitats. Crabs typically have a short, compact body with a hard exoskeleton for protection. The front pair of their ten legs are modified into pincers (chelae), used for feeding and defense.
27 Μαΐ 2024 · • Crabs are animals that help coral reefs to survive by cleaning away the debris that might otherwise kill the reefs. • Crabs have been around since Jurassic times, more than 200 million years ago. • Most crabs walk and swim sideways. • Male crabs of some species fight with one another over mates and hiding places.
Crab in action on a sea urchin. Crabs are a form of decapods (having eight walking legs and two grasping claws), along with lobsters, crayfish and shrimps. Crabs form an order within the decapods, called the Brachyura. Their short body is covered by a thick exoskeleton.
King crabs are decapod crustaceans of the family Lithodidae that are chiefly found in deep waters and are adapted to cold environments. [2][3] They are composed of two subfamilies: Lithodinae, which tend to inhabit deep waters, are globally distributed, and comprise the majority of the family's species diversity; [3][4] and Hapalogastrinae ...
