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

Hydatina physis

Micromelo guamensis

Class: Gastropoda  Cuvier, 1797
Subclass: Heterobranchia  J.E. Gray, 1840
Infraclass: Euthyneura Spengel, 1881
Order: Cephalaspidea  P. Fischer, 1883
Superfamily: Bulloidea  J.E. Gray, 1827
Family: Bullidae  J.E. Gray, 1827

Bulla ampulla

Bulla peasiana

Bulla vernicosa

Superfamily: Diaphanoidea  Odhner, 1914
Family: Diaphanidae  Odhner, 1914

Colpodaspis thompsoni

Colpodaspis sp. 02

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

Aliculastrum cylindricum	Atys naucum	Atys semistriatus	Atys sp. 03	Atys sp. 07
Atys sp. 10	Atys sp. 11	Diniatys dubius	Haloa aptei	Haminoeidae sp. 02
Haminoeidae sp. 09	Haminoeidae sp. 10	Haminoeidae sp. 11	Lamprohaminoea evelinae	Lamprohaminoea ovalis
Papawera maugeansis	Phanerophthalmus sp. 02	Roxaniella sp 01

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

Aglajidae sp. 01	Aglajidae sp. 05	Aglajidae sp. 06	Chelidonura amoena	Biuve fulvipunctata
Chelidonura hirundinina	Chelidonura pallida	Chelidonura punctata	Chelidonura varians	Mariaglaja inornata
Mariaglaja mandroroa	Mariaglaja_tsurugensis	Noalda sp. 01	Niparaya sp. 02	Noalda sp. 02
Odontoglaja guamensis	Philinopsis ctenophoraphaga	Philinopsis speciosa	Philinopsis troubridgensis	Spinophallus coronatus
Spinophallus falciphallus	Tubulophilinopsis gardineri	Tubulophilinopsis lineolata	Tubulophilinopsis pilsbryi	Tubulophilinopsisreticulata
Tubulophilinopsis cf. reticulata	Tubulophilinopsis sp. 02	Tubulophilinopsis sp. 04

Family:  Gastropteridae  Swainson, 1840

Gastropteridae sp. 05	Gastropteron bicornutum	Gastropteron sp. 04	Sagaminopteron nigropunctatum	Sagaminopteron ornatum
Sagaminopteron psychedelicum	Siphopteron brunneomarginatum	Siphopteron ladrones	Siphopteron makisig	Siphopteron nakakatuwa
Siphopteron sp. 02	Siphopteron sp. 08	Siphopteron tigrinum