OutgroupUNC_13497bLopha_haidingerianaDendostrea_fronsRastellwn_macropterwnRastellwn_carinatumAgerostrea_falcataAgerostrea_mesentericaLopha_solitariaNicaisolopha_nicaseiOstreola_conchaphilaSaccostrea_palmulaStriostrea_marganitaceaCrassostrea_columbiensisCrassostrea_virginicaLiostrea_hisingeriLiostrea_deltaLiostrea_eduliformisPernostreaPraexogyra_acuminataPraexogyra_calceolaNanogyra_nanaAmphidonteCeratostreon_texanumCeratostreon_zueatherfordensisExogyra_ponderosaExogyra_laeviscula_slash_tigrinaIlymatogyra_arietinaGryphaea_arcuataeformisGyphaea_arcuataGryphaea_sportellaGryphaea_pictavensisGryphaea_nebrascensisCatinula_beaumontiTexigraphaea_roemeriPycnodonte_roanokensisParahyotissa_mcgyntiOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Huelsenbeck_1994a