isopod


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isopod

(ī`səpŏd'), common name for crustaceans belonging to the order Isopoda and in the same subclass as lobsters and crayfish. Isopods are characterized by their flattened bodies, lack of a carapace, and gills located on the abdominal appendages. About 4,000 species are known. Most are aquatic; they are bottom-dwellers or are associated with water plants in freshwater or marine habitats. Some live under rocks on the shore, and some are terrestrial, living inconspicuously in surface litter or under logs. These, the pill bugs, or sow bugs, are the only large group of terrestrial crustaceans. Some isopods roll up like armadillos when disturbed. Some are parasitic, living on other crustaceans or in the mouths or on the gills of fishes. Most isopods are small, less than 1-2 in. (1.27 cm) long, but Bathynomus gigantea, a deep-sea species, may be over 1 ft (30 cm) long. Isopods are classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, subphylum Crustacea, order Isopoda.
References in periodicals archive ?
The damage caused by them resembles that of other copepods but the most serious effect of isopod infection is destruction of host tissue resulting from the pressure of the parasites body [25].
New terrestrial isopods of the genus Miktoniscus from eastern United States (Crustacea: Isopoda: Oniscoidea).
Ephemeroptera) (Komnick & Able 1971); labium of Cenocorixa bifida (Jarial 2003); "gills" (= endopodites) of terrestrial isopods like Oniscus (Kummel 1981); and the gills of crayfish, Pacifastacus leniusculus (Morse et al.
In terrestrial isopod species, Armadillo officinalis stridulates by rubbing some epimera and pereiopods together (Caruso and Costa, 1976).
Food selection as a means of Cu intake reduction in the terrestrial isopod Porcellio scaber (Crustacea, Isopoda).
They go from small parasites on fish gills into isopods that eat fish from the inside.
The presence of large adult isopod parasites in the oral cavity interferes with feeding, causing stress and growth retardation, and predisposition to invasion of bacteria and/or endoparasites (Varvarigos, 2003).
She has studied a range of animals from the giant isopod which looks like a large underwater wood louse to Antarctic fish.