Class Bivalvia Linnaeus, 1758 - bivalves
Subclass Protobranchia Pelseneer, 1889
Order Nuculanida Carter, Campbell & Campbell, 2000 [monotypic]
Superfamily Nuculanoidea Adams & Adams, 1858 (1854)
01 Family Nuculanidae Adams & Adams, 1858 (1854) - pointed nut clams
02 Family Bathyspinulidae Coan & Valentich-Scott, 1997
03 Family †Cadomiidae Scarlato & Starobogatov, 1979
04 Family †Cucullellidae Fischer, 1886
05 Family †Isoarcidae Keen, 1969
06 Family Malletiidae Adams & Adams, 1858 (1846)
07 Family Neilonellidae Schileyko, 1989
08 Family †Palaeoneilidae Babin, 1966
09 Family Phaseolidae Scarlato & Starobogatov, 1971
10 Family †Polidevciidae Kumpera, Prantl & Růžička, 1960, incertae sedis
11 Family Siliculidae Allen & Sanders, 1973
12 Family Tindariidae Verrill & Bush, 1897
13 Family Yoldiidae Dall, 1908