Crustaceans are arthropods that include well known species such as crabs, lobsters, and shrimp. The snapping or pistol shrimp is one of the loudest animals in the ocean. The animal snaps it claw which creates loud acoustic pressure.

About Crustaceans

Crustaceans (Crustacea) form a very large group of arthropods, usually treated as a subphylum, which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill and barnacles. The 67,000 described species range in size from Stygotantulus stocki at 0.1mm (0.004in), to the Japanese spider crab with a leg span of up to 12.5ft (3.8m) and a mass of 44lb (20kg). Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by the nauplius form of the larvae. Most crustaceans are free-living aquatic animals, but some are terrestrial (e.g. woodlice), some are parasitic (e.g. Rhizocephala, fish lice, tongue worms) and some are sessile (e.g. barnacles).

Contributions by Stemonitis, Seglea, and Apokryltaros.

New Questions for Crustaceans

See All Questions