Ostracoda

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Ostracoda

[ä′sträk·ə·də]
(invertebrate zoology)
A subclass of the class Crustacea containing small, bivalved aquatic forms; the body is unsegmented and there is no true abdominal region.
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 It might be outdated or ideologically biased.

Ostracoda

 

a subclass of invertebrates of the class Crustacea. The body, which measures from 0.2 to 23 mm long, is enclosed in a calcareous bivalve carapace. The head is indistinct from the trunk, which bears three pairs of limbs and terminates in a biramous furca. Most ostracods have one simple eye, but some have compound eyes. There are about 2,000 species, distributed in seas and freshwaters. The majority of ostracods are benthic. They serve as food for some commercial fishes. Fossil ostracods, which have been found in Cambrian deposits, are of major significance in stratigraphy and are the most important guide fossils used in locating petroleum and gas deposits.

REFERENCES

Bronshtein, Z. S. Ostracodapresnykhvod. Moscow-Leningrad, 1947.
Zhizn’ zhivotnykh, vol. 2. Moscow, 1968.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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(1974) described a fauna of bivalves, gastropods and ostracods, notably with few exclusively marine taxa.
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"Ostracods are the most abundant fossil arthropods, occurring ubiquitously as bivalved shells in rocks of the last 490 million years, and are common in most water environments today.
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A rich benthic fauna of animals typical of the Baltic Sea was found in the cores taken from the open bay of Reigi laht: the polychaete Hediste diversicolor, the oligochaetes Heterochaeta costata, Paranais litoralis, Amphichaeta sannio, and Lumbricillus sp., the priapulid Halicryptus spinulosus, a poorly preserved and hence unidentified prosobranchian gastropod, the meiobenthic ostracod Cyprideis torosa, and a number of marine nematodes.
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