Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Protobranchia Pelseneer, 1889
     Order Nuculanida Carter, Campbell & Campbell, 2000 [monotypic]
       Superfamily Nuculanoidea Adams & Adams, 1858 (1854)
         Family Yoldiidae Dall, 1908
           1 Subfamily Yoldiinae Dall, 1908
           2 Subfamily Yoldiellinae Allen & Hannah, 1986