Crustaceans

Crustaceans (from Latin word "crustacea" meaning: "those with shells" or "crusted ones") are mandibulate arthropods that are traditionally a part of the paraphyletic subphylum Crustacea (). Crustaceans are mainly aquatic, including decapods (shrimps, prawns, crabs, lobsters, and crayfish), seed shrimps, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, opossum shrimps, amphipods and mantis shrimp. It is now well accepted that hexapods (insects and entognathans) are cladistically crustaceans, with the two groups now combined in the monophyletic clade Pancrustacea. The thr

thumb|Using a nutcracker A nutcracker is a tool designed to open nuts by cracking their shells. There are many designs, including levers, screws, and ratchets. The lever version is also used for cracking lobster and crab shells.

thumb|Various crustaceans, all of interest to carcinologists. Carcinology, from Ancient Greek καρκίνος (karkínos), meaning "crab", and λόγος (lógos), meaning "study", is a branch of zoology that consists of the study of crustaceans. Crustaceans are a large traditional subphylum of arthropods classified by having a hard exoskeleton made of chitin or chitin and calcium, three body regions, and jointed, paired appendages. Crustaceans include lobsters, crayfish, shrimp, krill, copepods, barnacles and crabs. Most crustaceans are aquatic, but some can be terrestrial, sessile, or parasitic. Other nam

thumb|Porcelain crabs resemble true crabs, but are more closely related to [[squat lobsters and hermit crabs.]]

The clade Multicrustacea constitutes the largest superclass of crustaceans, containing approximately four-fifths of all described non-hexapod crustacean species, including crabs, lobsters, crayfish, shrimp, krill, prawns, woodlice, barnacles, copepods, amphipods, mantis shrimp and others. The largest branch of Multicrustacea is the class Malacostraca (see below).

The Hexanauplia is a clade proposed by Oakley et al. (2013) that constitutes a class of crustaceans, comprising the Copepoda and Thecostraca. A number of recent phylogenomic studies have not found support for this clade, with some supporting the alternative clade of Communostraca comprising Thecostraca and Malacostraca.

Ichthyostraca is a class of parasitic crustaceans. It is composed of two subclasses; Pentastomida and Branchiura. They mainly parasitize various vertebrates and feed on their blood or mucus.

Monodellidae is a family of crustaceans belonging to the order Thermosbaenacea.

REDIRECT Cephalobaena

Porocephalidae is a family of crustaceans belonging to the order Porocephalida.

species of crustacean

Microdajidae is a family of crustaceans belonging to the class Tantulocarida. The family was previously place in class Hexanauplia.

Doryphallophoridae is a family of crustaceans belonging to the class Tantulocarida. The family was previously placed in class Hexanauplia.

Reighardiidae is a family of crustaceans belonging to the subclass Pentastomida. It is the only family in the monotypic order Reighardiida. The species are parasites of birds, and are found globally.

Basipodellidae is a family of crustaceans belonging to the class Tantulocarida.

ethical debate

crustacean larval and immature stages between hatching and adult form

Ctenocheilocaris is a genus of marine crustacean. It is part of the family Derocheilocarididae and contains five species: Ctenocheilocaris armata Ctenocheilocaris claudiae Ctenocheilocaris enochra Ctenocheilocaris galvarini Ctenocheilocaris minor

Armillifer is a genus of tongue worms in the subclass Pentastomida. It contains the following species:

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