Amphipod, any member of the invertebrate order Amphipoda (class Crustacea) inhabiting all parts of the sea, lakes, rivers, sand beaches, caves, and moist (warm) habitats on many tropical islands. Marine amphipods have been found at depths of more than 9,100 m (30,000 feet).
Barnacle: Barnacle, any of more than 1,000 predominantly marine crustaceans of the subclass Cirripedia highly modified for sedentary life. There are about 850 free-living species (all marine) and about 260 species that are internal parasites of crabs and other crustaceans. A brief treatment of cirripedes
Branchiopods are free-living forms, the most primitive members of the arthropod subphylum Crustacea. They have compound eyes and usually a protective plate, or carapace. There are many body segments and four or more pairs of trunk limbs that are usually lobed, broad, and fringed on the inner side.
Global wild capture, 1950–2010, in tonnes, of caridean shrimp The most significant commercial species among the carideans is Pandalus borealis, followed by Crangon crangon. The wild capture production of P. borealis is about ten times that of C. crangon.
Crustaceans and Humans. Crustaceans are some of the most important marine life to humans - crabs, lobsters and shrimp are widely fished and consumed around the world. They may also be used in other ways - crustaceans like land hermit crabs may also be used as pets, and marine crustaceans may be used in aquariums.
Although most crustaceans are small, their morphology varies greatly and includes both the largest arthropod in the world – the Japanese spider crab with a leg span of 3.7 metres (12 ft) – and the smallest, the 1-micrometre-long (0.00004 in) Stygotantulus stocki.
Fairy shrimp, any of the crustaceans of the order Anostraca, so called because of their graceful movements and pastel colours. Some grow to 2.5 cm (about 1 inch) or more in length. They occur in freshwater ponds of Europe, Central Asia, western North America, the drier regions of Africa, and Australia.
Isopoda is an order of crustaceans that includes woodlice and their relatives. Isopods live in the sea, in fresh water, or on land. All have rigid, segmented exoskeletons, two pairs of antennae, seven pairs of jointed limbs on the thorax, and five pairs of branching appendages on the abdomen that are used in respiration.
Malacostracans are distributed worldwide in marine, freshwater, and terrestrial environments. There are roughly 25,000 species in as many as fifteen orders. Decapoda (crabs, lobsters, and shrimps) is the most speciose group within the Malacostraca. Malacostracans exhibit the hard, calcified exoskeleton typical of crustaceans.
Pentastomida are an enigmatic group of parasitic crustaceans commonly known as tongue worms due to the resemblance of the species of the genus Linguatula to a vertebrate tongue. There are about 130 extant species of pentastomids; all are obligate parasites with correspondingly degenerate anatomy.
A woodlouse (plural woodlice) is a terrestrial isopod crustacean with a rigid, segmented, long exoskeleton and fourteen jointed limbs. Woodlice mostly feed on dead plant material, and they are usually active at night. Woodlice form the suborder Oniscidea within the order Isopoda, with over 5,000 known species.