The Ecuadorian hermit crab (Coenobita compressus) also known as the Pacific hermit crab is a species of land hermit crab. It is one of the two land hermit crabs commonly sold in the United States as a pet, the other being the Caribbean hermit crab (Coenobita clypeatus).
Hermit crabs are decapod crustaceans of the superfamily Paguroidea. They are not closely related to true crabs. Hermit crabs are quite commonly seen in the intertidal zone: for example, in tide pools. Most species have long, soft abdomens which are protected from predators by a salvaged empty seashell carried on the crab's back, into which the crab's whole body can retract.
Emerita is a genus of oval-shaped crustaceans found on the Atlantic and Pacific coasts of North and South America. Emerita are popularly known as mole crabs, sand fleas, sand crabs, sea pigs, beach hoppers, and colloquially as lookie cookies. Although like true crabs they belong to the order Decapoda, they are classified in a different infraorder, Anomura (the true crabs are in the infraorder Brachyura). Sand crabs live under the sand in shallow water near the shore.
The flat-clawed hermit crab or grey hermit crab, Pagurus pollicaris, is a hermit crab commonly found along the Atlantic coast of the U.S. It inhabits discarded snail shells, to which hermit crab anemones sometimes attach. It occurs on all types of substrate, and is often found on mud flats at low tide. The adult flat-clawed hermit crab is typically 1¼ inches (32 mm) long, one inch (25 mm) wide, oblong, whitish or pale tan gray, with brown eye-stalks.
The Caribbean hermit crab (Coenobita clypeatus), also known as the West Atlantic crab, the tree crab, the soldier crab, and the purple pincher (due to the distinctive purple claw), is a species of land hermit crab native to the west Atlantic, Bahamas, Belize, southern Florida, Venezuela, the Virgin Islands, and the West Indies. This species is one of the two land hermit crabs commonly sold in the United States as a pet, the other being the Ecuadorian hermit crab.
The coconut crab, Birgus latro, is the largest land-living arthropod in the world, and is probably at the upper limit of how big terrestrial animals with exoskeletons can become in today's atmosphere. The species inhabits the coastal forest regions of many Indo-Pacific islands, although localized extinction has occurred where the crab is sympatric with man. Generally nocturnal, they remain hidden during the day and emerge only on some nights to forage.
King crabs, also called stone crabs, are a superfamily of crab-like decapod crustaceans chiefly found in cold seas. Because of their large size and the taste of their flesh, many species are widely caught and sold as food, the most common being the red king crab, Paralithodes camtschaticus). King crabs are generally believed to be derived from hermit crab-like ancestors, which may explain the asymmetry still found in the adult forms.
The Australian land hermit crab (Coenobita variabilis) is one of two terrestrial hermit crab species native to Australia and is found in northern parts of Australia including northern Western Australia, Northern Territory and northern Queensland. The other terrestrial species is the strawberry land hermit crab (C. perlatus) which is reportedly restricted to the islands and coral cays of the Great Barrier Reef, north-eastern Australia.
Squat lobsters are decapod crustaceans of the families Galatheidae, Chirostylidae and Kiwaidae, including the common genera Galathea and Munida. They are not lobsters at all, but are more closely related to porcelain crabs, hermit crabs and then, more distantly, true crabs. They are distributed worldwide in the oceans, and occur from near the surface to deep sea hydrothermal vents. There are currently 870 described species .
Anomura is a group of decapod crustaceans, including hermit crabs and others. Although the names of many anomurans includes the word crab, all true crabs are in the sister group to the Anomura, the Brachyura (the two groups together form the clade Meiura). The name Anomala reflects the unusual variety of forms in this group; whereas all crabs share some obvious similarities, the various groups of anomurans are quite dissimilar.
Porcelain crabs are decapod crustaceans in the family Porcellanidae, which superficially resemble true crabs. They are a good example of carcinisation, whereby a non-crab-like animal (in this case a relative of a squat lobster) evolves into an animal that only a specialist would know is not a true crab. They live in all the world's oceans, except the Arctic Ocean and the Antarctic. Porcelain crabs are small, usually with body widths of 1-2 cm.