Large sinistral, biconcave shell, whorls rounded and spire sunken. Umbilicus very wide. Animal brown or red with thin tentacles.It differs from the similar Planorbella duryi in having more rounded whorls and lacking the distinct mantle mottling of that species.
Planorbarius corneus (Linnaeus, 1758)
Common name: Ram's Horn Snail.
Original name: Helix corneus Linnaeus, 1758
Original reference: Linnaeus, C. (1758). Systema Naturae, per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Editio decima, reformata. Holmiae : Laurentii Salvii Tom. 1-824 pp.
Type locality: Northern Europe.
Synonyms: Planorbis adelosius Bourguignat, 1859
Introduced from Europe, common in aquariums but not established (to our knowledge) in the wild in mainland Australia but in ponds in urban areas in Tasmania (Launceston).
Native distribution Western Europe to Siberia and the Middle East.
This large, red-coloured species is sometimes encountered in the aquarium trade. It has gone by the name of Planorbis corneus for many years.
Baker, F. C. (1945). The molluscan family Planorbidae. Urbana USA, University of Illinois Press.
Kershaw, R. C. (1991). Snail and Slug Pests of Tasmania, Queen Victoria Museum and Art Gallery.
Ng, T.H., Tan, S.K., Wong, W.H., Meier, R., Chan, S-Y., Tan, H.H. and Yeo, D.C.J. 2016. Molluscs for Sale: Assessment of Freshwater Gastropods and Bivalves in the Ornamental Pet Trade. PLOS One. DOI:10.1371/journal.pone.0161130.
Smith, B. J. and Kershaw, R. C. (1979). Field guide to the non-marine molluscs of south eastern Australia. Australian National University Press, Canberra, Australia.
Smith, B. J. & Kershaw, R. C. (1981). Tasmanian Land and Freshwater Molluscs. Hobart, University of Tasmania.