CyrenoididaeCyrenoididae is a taxonomic family of saltwater clams, marine bivalve mollusks in the superfamily Cyrenoidea.GeneraThe following genera are recognised in the family Cyrenoididae:Cyanocyclas Blainville, 1818Cyrenoida de Joannis, 1835 Geloina J. E. Gray, 1842Polymesoda Rafinesque, 1820