Previously, the pulmonate family Arionidae was regarded as including the subfamilies Arioninae, Anadeninae and the American subfamily Ariolimacinae (Pilsbry 1948).
The members of Ariopeltinae differ from other Arionidae in still retaining a coherent shell plate, while the tentacular and pharyngeal retractor muscles are longer and have a common point of origin (in some even a common stem) at the posterior edge of the pallium.
2005) by retaining Ariolimacinae as a subfamily of Arionidae.
In the past, the position of the South African genus Oopelta within the family Arionidae was regarded as problematic.
A comparison between these taxa that show primitive features and the advanced Arionidae of Europe accordingly seems to suggest a Gondwana origin for the superfamily Arionoidea.
Oopeltidae, Anadenidae, Arionidae, Philomycidae, Succineidae, Athoracophoridae.