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.

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.
References in periodicals archive ?
The highest average TOC values are noted in clays and marls of the ostracod horizon (4.46%).
The ostracods with larger shells may have been making either more or bigger sperm, he said.
(1974) described a fauna of bivalves, gastropods and ostracods, notably with few exclusively marine taxa.
CCA identified seven environmental variables (CaC[O.sub.3], TP, TN, C/N, MAT, MAR, BSi) that significantly explained the variation in the ostracod assemblages (Figure 5).
Performing quantities studies in 4 stations of southern part of Caspian Sea led to identifying Ostracodes in this part, so that 21 species of Ostracodes of this region were identified by these studies (Cohen and Layback 2013).
"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.
(1980): The littoral system ostracodes from the bay of Bou-Ismail, Algeria.
Ontogenetic Increase in Archimedian Weigth of the Ostracod Chlamydotheca unispinosa (Baird).
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.