Arionoidei (Roundback slugs and allies)
Superfamily: Arionoidea [29 genera]
Family: Anadenidae (Anadenid slugs) [2 genera]
–No subordinate taxa
Family: Ariolimacidae (Banana slugs and allies) [11 genera]
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Anadenulus cockerelli | (Hemphill, 1890) | American keeled slug | (rediscovered) | southern California (Kern, Los Angeles, Orange & San Diego counties), USA | Rediscovered | Access |
Family: Arionidae (Roundback slugs) [9 genera]
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Arion simrothi | Künkel, 1909 | - | 1909 or earlier | mountains near Gengenbach, southwestern Germany | Data Deficient or Extinct if valid | Access |
| Arion transsylvanus | Simroth, 1885 | - | (rediscovered) | Hungary, Poland & Romania | Rediscovered | Access |
Family: Binneyidae (Binneyid shelled slugs) [3 genera]
–No subordinate taxa
Family: Philomycidae (Mantleslugs) [4 genera]
–No subordinate taxa
Statistics
| Conservation status | Number of taxa (in percentage) |
| Extinct | 0 |
| Missing | 0 |
| Extinct in the Wild | 0 |
| Possibly Extinct in the Wild | 0 |
| Globally Rediscovered | 2 (66.67%) |
| Rediscovered in the Wild | 0 |
| Reintroduced | 0 |
| Hypothetical | 0 |
| Invalid | 0 |
| Erroneously listed | 0 |
| Uncertain status | 1 (33.33%) |
| Total | 3 |