previously placed in the Order: CEPHALASPIDEA, in the Subclass: OPISTHOBRANCHIA

Class : Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
informal group:  Lower Heterobranchia (Allogastropoda)  Haszprunar, 1985
according to Bouchet & Rocroi (2005) is the superfamily Acteonoidea no more in the Order Cephalaspidea

Superfamily:  Acteonoidea  d'Orbigny, 1843
Family:  Aplustridae  J.E. Gray, 1847

Hydatina amplustre

Class : Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
Infraclass: Euthyneura Spengel, 1881
Order: Cephalaspidea  P. Fischer, 1883
Superfamily: Haminoeoidea  Pilsbry, 1895

Family: Haminoeidae  Pilsbry, 1895

Haloa aptei

Haloa pemphis

Lamprohaminoea cymbalum

Superfamily: Philinoidea  J.E. Gray, 1850
Family: Aglajidae  Pilsbry, 1895 (1847)

Biuve fulvipunctata

Chelidonura hirundinina

Chelidonura punctata

Tubulophilinopsis gardineri

Family: Gastropteridae  Swainson, 1840

Sagaminopteron psychedelicum