Informal group "Lower Heterobranchia"

(= Allogastropoda)

Unassigned to a superfamily
- Family Cimidae
- Family Dolomitellidae †
- Family Heterosubulitidae †
- Family Kuskokwimiidae †
- Family Misurinellidae †
- Family Orbitestellidae
- Family Tjaernoeiidae
- Family Xylodisculidae
Superfamily Acteonoidea
- Family Acteonidae
- Family Acteonellidae †
- Family Aplustridae
- Family Bullinidae
- Family Zardinellidae †
Superfamily Architectonicoidea
- Family Architectonicidae
- Family Amphitomariidae †
- Family Cassianaxidae †
Superfamily Glacidorboidea
- Family Glacidorbidae
Superfamily Mathildoidea
- Family Mathildidae
- Family Ampezzanildidae †
- Family Anoptychiidae †
- Family Gordenellidae †
- Family Tofanellidae †
- Family Trachoecidae †
Superfamily Nerineoidea
- Family Nerineidae †
- Family Ceritellidae †
- Family Nerinellidae †
Superfamily Omalogyroidea
- Family Omalogyridae
- Family Studraxidae †
Superfamily Pyramidelloidea
- Family Pyramidellidae
- Family Amathinidae
- Family Heteroneritidae †
- Family Murchisonellidae
Superfamily Ringiculoidea

Common valvata (Valvata piscinalis).
Picture: © Alexander Mrkvicka, Vienna (mrkvicka.at).
- Family Ringiculidae
Superfamily Rissoelloidea
- Family Rissoellidae
Superfamily Streptacidoidea
- Family Streptacididae †
- Family Cassianebalidae †
Superfamily Valvatoidea
- Family Valvatidae
- Family Cornirostridae
- Family Hyalogyrinidae
- Family Provalvatidae †