MolluscIreland - land and freshwater
  • Carychium tridentatum (Risso 1826) Slender herald snail
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Carychium tridentatum
© Dr Roy Anderson

Map hosted by the National Biodiversity Data Centre, Waterford
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A tiny dull white shell with oval aperture ornamented with two denticles and a thickened lip produced into a small, inward-pointing knob in the middle. Spire relatively longer and body whorl narrower than in Carychium minimum. Mainly in woods but also in wet, open places.

Key characteristics

  • A tiny dull white, cylindrical shell
  • Main differences from Carychium minimum lie in the narrower body whorl and relatively tall spire
  • Internally, there is a sinuate lamella running around the columella, seen by breaking open the front of the shell above the aperture

Size

1.8-2.0 mm.

World Distribution

With a similar distribution to Carychium minimum but not in Siberia. Distribution type: European Boreo-temperate (53).

Irish Distribution

Widespread and frequent in all kinds of ancient broadleaf woodland. Also, at the margins of wetlands in the company of C. minimum.

Ecology

  • Found in deep, stable leaf litter in old woods, particularly under evergreens such as holly Ilex, but also under broadleafs with durable leaf litter such as beech Fagus
  • Like C. minimum can inhabit wet places outside woodland, usually in dense vegetation

Red List status

  • Least concern (lc).

Wikipedia link

Wikipedia page for Carychium tridentatum

 Anderson, R., (2016). Carychium tridentatum (Risso 1826). [In] MolluscIreland.
http://www.habitas.org.uk/molluscireland/species.asp?ID=51 Accessed on 2017-12-12.