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 ?
Locally, in the stratigraphic section ACE, in the upper part of this association, abundant quartz grains and charophytes have been observed together with gastropods and other mollusks, ostracods and scarce echinoderms.
cascadae at Mack Creek consumed philopotamid caddis flies and ostracods at levels well above their abundance, and heptageniid mayflies and perlid stoneflies well below their abundance (Table 3).
The specimen, which was found in rocks in Herefordshire, represents a new species of ostracod, and has been named Nasunaris flata.
Key words: ostracodes, distributions, biogeography, limnology, paleolimnology, Canadian Arctic
Aside from the myodocopids, the other major group of swimming ostracodes is the Cypridoidea, a mostly freshwater clade within the podocopids.
Rich and heterogeneous fossil ostracod fauna in the Ordovician sediment intrusions at Osmussaar Island, Estonia, reveals an ancient impact event.
Like MF1, it also includes skeletal detritus of bryozoan, crinoids, ostracods and brachiopod shells.
plumieri in the sizes A to D are the amphipods, copepods and tanaidaceous, however in the later sizes (>E), detritus and ostracods were part of their main diet.
The ostracods with larger shells may have been making either more or bigger sperm, he said.
The US-based researchers looked at 93 species of extinct ostracods that lived about 85 million to 65 million years ago during the late Cretaceous period.
News records of phoresy and hyperphoresy among treefrogs, ostracods, and ciliates in bromeliad of Atlantic forest.