MolluscIreland - land and freshwater
  • Discus (Gonyodiscus) rotundatus (O. F. Müller 1774) Rounded Snail
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Discus (Gonyodiscus) rotundatus
© Dr Roy Anderson

Map hosted by the National Biodiversity Data Centre, Waterford
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Shell a very low, depressed cone of up to 6 whorls with very wide and deep umbilicus. Pale brown with distinctive darker red-brown radial stripes. Surface marked by regular, strong radial ribs. Mouth oval, periphery shouldered. Very common.

Key characteristics

  • Shell a very depressed, broad cone
  • Coloured pale brown with distinctive red-brown radial stripes although these can sometimes be faint or missing
  • Surface dull with strong, regular radial ribs
  • Shell margin slightly shouldered
  • Umbilicus very wide and deep

Size

6-7 mm wide.

World Distribution

Found across northern and central Europe to the Mediteranean where it is spreading by human agency Distribution type: European Wide-temperate (63).

Irish Distribution

Probably the commonest shelled mollusc in Ireland, followed closely by Cochlicopa lubrica.

Ecology

  • Ubiquitous in hedgerows or any kind of man-altered terrain and in woods
  • Rare on nutrient poor (dystrophic) soils and rocks
  • Nevertheless, sometimes seen in lagg woodland around the edges of raised bog and often on agriculturally enriched former peatlands

Red List status

  • Least concern (lc).

Wikipedia link

Wikipedia page for Discus rotundatus

 Anderson, R., (2016). Discus (Gonyodiscus) rotundatus (O. F. Müller 1774). [In] MolluscIreland.
http://www.habitas.org.uk/molluscireland/species.asp?ID=75 Accessed on 2017-12-17.