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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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The ostrocod is about the size of a water flea - only 5mm long - but its appendage takes up about one third of its body.