Tandonia sowerbyi is a species of air-breathing, keeled, land slug, a shell-less terrestrial gastropod mollusk in the family Milacidae.

Description

This is a keeled slug attained 80 mm in length.

Habitat

This slug occurs in open habitats such as grasslands and shrublands; it can be abundant in arable land and gardens.

Distribution

This slug is native to Europe, likely originally only to Greece. It is now widespread in southeastern and Atlantic Europe: It is also present in: This species has not yet become established in the USA, but it is considered to represent a potentially serious threat as a pest, an invasive species which could negatively affect agriculture, natural ecosystems, human health or commerce. Therefore it has been suggested that this species be given top national quarantine significance in the USA.