Ptychobranchus fasciolarisPtychobranchus fasciolaris is a species in the genus Ptychobranchus, family Unionidae, order Unionida.Scientific classificationRankTaxonDomainEukaryotaKingdomAnimaliaPhylumMolluscaClassBivalviaOrderUnionidaFamilyUnionidaeGenusPtychobranchusSpeciesPtychobranchus fasciolaris