Taxonomy
Of the six orders of Pulmonata, two – the Onchidiacea and Soleolifera – solely comprise slugs. A third family, the Sigmurethra, contains various clades of snails, semi-slugs (i.e. snails whose shells are too small for them to retract fully into) and slugs.
The taxonomy of this group is in the process of being revised in the light of DNA sequencing. It appears that pulmonates are paraphyletic and basal to the opisthobranchs which are a terminal branch of the tree. The family Ellobiidae are also polyphyletic.
- Subinfraorder Orthurethra
- Superfamily Achatinelloidea
- Superfamily Cochlicopoidea
- Superfamily Partuloidea
- Superfamily Pupilloidea
- Subinfraorder Sigmurethra
- Superfamily Acavoidea
- Superfamily Achatinoidea
- Superfamily Aillyoidea
- Superfamily Arionoidea
- Superfamily Athoracophoroidea
- Family Athoracophoridae
- Superfamily Orthalicoidea
- Subfamily Bulimulinae
- Superfamily Camaenoidea
- Superfamily Clausilioidea
- Superfamily Dyakioidea
- Superfamily Gastrodontoidea
- Superfamily Helicoidea
- Superfamily Helixarionoidea
- Superfamily Limacoidea
- Superfamily Oleacinoidea
- Superfamily Orthalicoidea
- Superfamily Plectopylidoidea
- Superfamily Polygyroidea
- Superfamily Punctoidea
- Superfamily Rhytidoidea
- Family Rhytididae
- Superfamily Sagdidoidera
- Superfamily Staffordioidea
- Superfamily Streptaxoidea
- Superfamily Strophocheiloidea
- Superfamily Parmacelloidea
- Superfamily Zonitoidea
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