Definition of Ostracoda in US English:


plural noun

  • A class of minute aquatic crustaceans that have a hinged shell from which the antennae protrude, and a reduced number of appendages.

    • ‘Hemoglobins have been described in a select number of crustacean groups, including the Branchiopoda, Ostracoda, Copepoda, Cirrepedia, and Decapoda.’
    • ‘Hemoglobin is present in Branchiopoda, Ostracoda, Copepoda, rhizocephalan Cirripedia and one suborder of amphipodan Malacostraca.’
    • ‘The Ostracoda are one of the most successful crustacean groups with approximately 8000 living species.’
    • ‘On the whole the maxillopodan groups Ostracoda and Cirripedia and the Malacostraca have left the most significant fossil records.’
    • ‘Crustaceans possessing many primitive features tend to have myogenic hearts, although neurogenicity is dominant in the more advanced malacostracan groups and possibly members of the Ostracoda.’


Modern Latin (plural), from Greek ostrakōdēs ‘testaceous’, from ostrakon ‘shell’.