NuculanidaNuculanida is an order in the class Bivalvia, containing 461 described species.Scientific classificationRankTaxonDomainEukaryotaKingdomAnimaliaPhylumMolluscaClassBivalviaOrderNuculanidaFamiliesNuculanidae196Yoldiidae140Malletiidae54Neilonellidae33Tindariidae21Siliculidae7Sareptidae5Pristiglomidae3Lametilidae2