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 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: Great Britain Ireland Italy Portugal The Netherlands The Balkans
It is also present in: New Zealand South America
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..
References
AnimalBase info at: Spencer, H.G., Marshall, B.A. & Willan, R.C. (2009). Checklist of New Zealand living Mollusca. pp 196–219 in Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.