Heterobranchia
clade Systellommatophora [=Gymnomorpha]
Members of the clade Systellommatophora are air breathing slugs. Two superfamilies are recognized, Onchidioidea, primarily marine, and Veronicelloidea, terrestrial.
superfamily Onchidioidea
family Onchidiidae [=Peroniidae, Onchidellidae, Scaphidae]
A mostly marine family, but contains a few semi-terrestrial species (marine intertidal) and two terrestrial species, Oncis ponsonbyi (=Platevindex ponsonbyi) and Semperoncis montana (=Platevindex apoikistes and Semperella montana), both live in high altitude rainforests in SE Asia.
superfamily Veronicelloidea [=Soleolifera]
family Rathouisiidae
Some species are carnivorous, diet includes gastropods.
Genera:
| Atopos | Malaysia, Indonesia, New Guinea |
| Rathouisia | Mexico (Tamaulipas), Pakistan |
family Veronicellidae [=Vaginulidae]
Terrestrial slugs, common name is leatherleaf slugs.
| Angustipes | Texas, Louisiana, Mississipi, Florida, Brazil, Peru |
| Diplosolenodes | |
| Laevicaulis | Texas, Democratic Republic of the Congo, Andaman and Nicobar, Japan, Philippines, New Caledonia, Taiwan |
| Latipes | |
| Leidyua | Haiti, Puerto Rico, Grand Cayman, Florida, Costa Rica, Belize, Mexico (Veracruz, Tamaulipas) |
| Sarasinula | Venezuela, Guyana, Philippines, Indonesia, Australia |
| Sarasomia | |
| Vaginulus | |
| Valiguna | |
| Veronicella | worldwide |