ostracod

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ostracod

a small, aquatic, bivalved crustacean of the subclass Ostracoda. The calcified shells of ostracods form important indicators in palaeontology and are important in palaeoclimatological studies as they are sensitive to differing concentrations of dissolved materials.
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Cosmopolitanism is the prominent feature of distribution of freshwater ostracods. Victor and Fernando (1982) while discussing the distribution in south-east Asia have shown that 14 genera of family Cyprididae were cosmopolitan and one genus each had the affinities of Palaeartic-Oriental, Australian-Ethiopian region.
Thermodiaptomus was more abundant in the diet of males of both species, while ostracods recorded higher numerical abundance as a food item in females of both species.
Geologists find ostracods useful in order to help recreate past environments - the type of ostracod found in a rock sample would, for example, help to determine a picture of ancient conditions like water depth and salinity.
Arctic freshwater ostracods from modern periglacial environments in the Lena River Delta (Siberian Arctic, Russia): Geochemical applications for palaeoenvironmental reconstructions.
Additionally, nineteen carbonate rock samples, at approximately 1-m intervals, were collected from limestone beds of the Vergale-50 drill core above and below the Collector for micropalaeontological analysis based on ostracods. These samples were disintegrated using sodium hyposulphite with repeated heating and cooling (Meidla 1996).
Overall, the estuary midstream and upstream supported the highest densities of protozoans, rotifers, and most meroplanktonic larvae, whereas the estuary downstream supported the highest densities of copepods, cladocerans, ostracods, molluscs, chaetognths, and larvaceans.
This facies is bioclastic grainstone and consists of brachiopod shells, bryozoans, ostracods, gastropods, crinoids and mollusks (Fig.
The amphipod, copepod, tanaidaceous and polychaete trophic groups being the preferential food (FO >50%) in at least three of the species studied; and the foraminifera, ostracods and UOM (unidentified organic matter) were present preferentially in some of the species analyzed (E.
The new research, published this month in the journal Nature, documented the fates of a class of shrimp-like animals called cytheroid ostracods, among which there are dozens of different species -- some living, some extinct.