Any of numerous small chiefly aquatic crustaceans of the class Ostracoda, having a bivalve carapace and including many extinct species that are commonly found as fossils.
Any of various classes (esp. Ostracoda) of small, freshwater or marine crustaceans, having a bivalve carapace that covers the entire body.
Origin of ostracod
New Latin Ostracōda subclass name from Greek ostrakōdēs testaceous from ostrakon shell ost- in Indo-European roots