Isopoda

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Isopoda

[ī′säp·ə·də]
(invertebrate zoology)
An order of malacostracan crustaceans characterized by a cephalon bearing one pair of maxillipeds in addition to the antennae, mandibles, and maxillae.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Isopoda

 

an order of higher crustaceans. The body, which is flattened in a dorsoventral direction, is from 0.1 to 27 cm long (1–2 cm usually). The eyes are sessile. One or, less frequently, two thoracic somites are fused with the head, and one or several abdominal somites are fused with the telson. The first pair of thoracic limbs have been transformed into maxillipeds. The remaining seven pairs are uniramose and are of approximately the same length and structure. The abdominal limbs are platelike and partially transformed into gills. The heart is in the abdominal section. Development is mostly direct. The female carries the embryos and young in a brood pouch formed by processes of the thoracic limbs.

There are approximately 4,500 species of isopods, distributed primarily in seas but also encountered in freshwaters and on dry land. Many species are eaten by fish. Mesidothea entomon damages fishnets and the fish caught in them; species of the genus Limnoria gnaw holes in wood, destroying wooden structures.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The relationship of terrestrial isopods in the ecosystem has not been understood until recently.
Two in-faunal invertebrates of mid-intertidal to subtidal sediments (the spionid polychaete Marenzelleria viridis and the isopod Cyathura polita) and the benthivorous American eel (Anguilla rostrata), had the lowest levels of tracer enrichment observed in fauna collected during the study (Fig.
Diet, food preference and digestive efficiency in intertidal isopods inhabiting macroalgae.
Microgeographic genetic differentiation in the intertidal isopod Jaera albifrons Leach.
It will be quite interesting to check both the Pacific and Caribbean populations of these five species with molecular markers to see if there is a criptic diversity between them, as revealed in other littoral isopods, e.g.
The water pH in the vicinity of Hel Peninsula, where the isopods were collected, varied from 7.23 in the near-bottom water in September 2010 (Fig.
The isopod parasites have no important morphological changes; except for the anterior prehensile appendages and adaptation of the armor oral to feed, its morphology is quite similar to the free living forms.
A scanning electron microscopy study of cuticular structures in some Ohio isopods (Oniscoidea: Isopoda: Crustacea).
Isopods of the semiterrestrial oniscid species Ligia exotica, which live on the seashore among pilings, beach fortifications, jetties, and rocks, usually not more than a few meters from the water's edge, lead a rather different life from that of wholly terrestrial isopods such as pill bugs.
The survey turned up more new isopod species than had been found in the past century of exploring the entire Antarctic continental shelf, says Brandt.
DIET: Bottom dwelling organisms, amphipods, isopods, crustaceans, and marine worms.