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.
- On the whole the maxillopodan groups Ostracoda and Cirripedia and the Malacostraca have left the most significant fossil records.
Modern Latin (plural), from Greek ostrakōdēs 'testaceous', from ostrakon 'shell'.
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