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 physis

Micromelo guamensis

Class:  Gastropoda  Cuvier, 1797
Subclass:  Heterobranchia  J.E. Gray, 1840
Clade:  Euthyneura Spengel, 1881
Superorder:  Euopisthobranchia  Jörger et al., 2010
Order:  Cephalaspidea  P. Fischer, 1883
Superfamily:  Bulloidea  J.E. Gray, 1827
Family:  Bullidae  J.E. Gray, 1827

Bulla arabica

Superfamily:  Haminoeoidea  Pilsbry, 1895
Family:  Haminoeidae  Pilsbry, 1895

Atys naucum	Atys semistriatus	Diniatys dentifer	Diniatys dubius	Lamprohaminoea ovalis
Haloa pemphis	Haminoeidae sp. 05	Liloa mongii	Phanerophthalmus albocollaris

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

Chelidonura flavolobata	Biuve fulvipunctata	Chelidonura livida	Chelidonura punctata	Mariaglaja tsurugensis
Odontoglaja mosaica	Philinopsis ctenophoraphaga	Philinopsis speciosa	Spinoaglaja sp. 01	Spinophallus falciphallus
Tubulophilinopsis pilsbryi	Tubulophilinopsis reticulata	Tubulophilinopsis sp. 03

Family:  Gastropteridae  Swainson, 1840

Gastropteron bicornutum

Sagaminopteron ornatum

Sagaminopteron psychedelicum

Siphopteron sp. 11