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

Class: Gastropoda   Cuvier, 1797
Clade:  Heterobranchia    Gray J.E., 1840
Infraclade:  Lower Heterobranchia    unknown author 
according to Bouchet & Rocroi (2005) are
the superfamilies: Acteonoidea and Ringiculoidea no more in the Suborder Cephalaspidea of the Subclass: OPISTHOBRANCHIA

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

Hydatina physis

Hydatina zonata

Micromelo undata

Clade:  Euthyneura  Spengel, 1881
Clade:  Euopisthobranchia  Jörger et al., 2010
Clade:  Cephalaspidea  Fischer, P., 1883

Superfamily:  Bulloidea  Gray, 1827
Family:  Bullidae  Gray, 1827

Bulla ampulla

Bulla orientalis

Bulla sp. 01

Colpodaspis thompsoni

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

Aliculastrum cylindricum	Atys debilis	Atys naucum	Atys sp. 01	Haminoea cymbalum
Haminoea ovalis	Haminoea sp. 01	Haminoea sp. 02	Haminoea sp. 03	Liloa curta

Phanerophthalmus albocollaris

Phanerophthalmus smaragdinus

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

Aglaja orientalis	Aglaja sp. 01	Chelidonura amoena	Chelidonura electra	Chelidonura fulvipunctata
Chelidonura hirundinina	Chelidonura inornata	Chelidonura pallida	Chelidonura sandrana	Chelidonura sp. 01
Chelidonura sp. 02	Chelidonura sp. 03	Chelidonura tsurugensis	Chelidonura varians	Nakamigawaia spiralis
Odontoglaja guamensis	Philinopsis falciphallus	Philinopsis gardineri	Philinopsis lineolata	Philinopsis pilsbryi
Philinopsis reticulata	Philinopsis cf. reticulata	Philinopsis speciosa	Philinopsis sp. 01

Gastropteridae sp. 01	Gastropteron bicornutum	Sagaminopteron ornatum	Sagaminopteron psychedelicum	Sagaminopteron sp. 01
Sagaminopteron sp. 02	Sagaminopteron sp. 03	Siphopteron brunneomarginatum	Siphopteron quadrispinosum	Siphopteron tigrinum

Philine rubrata

Ilbiidae sp. 01