1860–65; < Neo-Latin Ostracoda name of the subclass < Greek ostrakṓdēs, equivalent to óstrak(on) shell, tile (see ostracize) + -ōdēs -ode1

ostracodan [os-truh-kohd-n] , ostracodous, adjective
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World English Dictionary
ostracod (ˈɒstrəˌkɒd)
any minute crustacean of the mainly freshwater subclass Ostracoda, in which the body is enclosed in a transparent two-valved carapace
[C19: via New Latin from Greek ostrakōdēs having a shell, from ostrakon shell]

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Encyclopedia Britannica


any of a widely distributed group of crustaceans resembling mussels. Mussel shrimp differ from most crustaceans in having a very short trunk that has lost its external segmentation, or divisions. Nearly all of the body is encased in a hard covering, or carapace. The 2,000 living species include marine, freshwater, and terrestrial forms

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Fragmented shells of freshwater molluscs and an ostracod occur within a marlstone bed.
Additional variation in ostracod species richness was further explained by water and sediment depth.
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