Ostracoda


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Related to Ostracoda: Cladocera

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 ?
IVI CIPO LPAT LVEN Nematoda + + + + Oligochaeta + + + + Narapa bonettoi + + + - Hirudinea - + - + Thiaridae - + - + Corbiculidae + + - + Mytilidae - + - - Hydracarina + + + + Cladocera + + + + Ostracoda + + + + Calanoida + + + + Cyclopoida + + + + Entomobryidae + + + + Sminthuridae - - - + Polymitarcyidae + + + + Leptohyphidae + + - + Baetidae - + - + Gomphidae + + - + Coenagronidae - + - - Hydropsychidae + + - - Polycentropodidae + + - - Hydroptilidae - + - - Dytiscidae + - - + Hydrophilidae + - - - Elmidae + + - + Ceratopogonidae + + + + Chaoboridae - - + - Chironomidae + + + + Culicidae + - - - Tabela 1.
Taxa Febrero No insectos S1 S2 S3 Turbellaria - 3 2 Nemathelmintes - - - Oligochaeta 56 13 14 Hirudinea - - - Gastropoda - - - Hydracarina - 2 - Amphipoda - - - Ostracoda 105 - - Copepoda 205 - - Insectos Collembola Hypogasturidae - - 5 Poduridae - - 1 Plecoptera Gripopterygidae Claudioperla tigrina 4 4 23 Ephemeroptera Baetidae Andesiops peruvianus 929 27 134 Leptophlebiidae Meridialaris tintinnabula 10 30 72 Hemiptera Notonectidae - - 1 Coleoptera Elmidae 6 - - Dytiscidae - - - Trichoptera Limnephilidae Antartoecia nordenskioeldi 10 5 - Hydrobiosidae Cailloma rubemarini - 62 - Hydroptilidae Hydroptila sp.?
californicus), bryozoan remains, Chironomidae, and Ostracoda was observed as total length of the fishes increased (Figures 2a, b).
Miscellaneous aquatic invertebrates (Ostracoda, Trichoptera and Odonata), aquatic and terrestrial Coleoptera, and Corixidae occurred in the diet primarily during January through June and collectively represented 0 to 54% (mean = 9%) of the diet across all samples.
* - - Pleuroxus aduncus (Jurine, 1820) * 0.333 - Pleuroxus caca Baird, 1843 * 0.333 0.333 Pleuroxus laevis Sars, 1861 * - - Pleuroxus trigonellus (Muller, 1785) * - - Pleuroxus truncatus (Muller, 1785) * - - Acroperus harpae (Baird, 1834) * - - Camptocercus similis Sars, 1901 * - - Chydorus globosus (Baird, 1843) * - - Daphnia peruviana Harding, 1955 * - - Ceriodaphnia dubia Richard, 1894 * 0.666 0.333 Simocephalus vetulus (Muller, 1776) * 0.333 - Ostracoda sp.
Pero considerando valores absolutos, no los promedios, la conductividad y el contenido de carbono organico si mostraron marcadas diferencias, pudiendo ser factores determinantes de las variaciones encontradas en la densidad de Ostracoda. En el sitio 2 la conductividad llego a 710[my]S*[cm.sup.-1] y el contenido de carbono organico en sedimentos a 2,6%.
Amphipoda 13.8 0.1 Amphipoda Ostracoda 6.1 0.0 Ostracoda Specific Prey taxa Lowest taxon volume Percent Osteichthyes "fish" unid.