Shining ram's-horn snail (Segmentina nitida)

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Shining ram's-horn snail
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Shining ram's-horn snail fact file

Shining ram's-horn snail description

KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderLymnophila
FamilyPlanorbidae
GenusSegmentina (1)

The shining ram's-horn snail has a smooth, glossy and iridescent shell (4), measuring up to 6mm across (2), with no more than 5 whorls. The outermost whorl (body whorl) is expanded and overlaps most of the others (4), with a heart shaped aperture(4).

Size
Height: 2 mm (2)
Breadth: 5-6 mm (2)
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Shining ram's-horn snail biology

Little is known of the biology of this species.

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Shining ram's-horn snail range

This snail is found throughout Europe, reaching as far north as Scandinavia. In the UK it has undergone a severe decline and is now restricted to the Norfolk Broads, parts of the Kentish Stour marshes (5), and Pevensey Levels after formerly being fairly widespread throughout much of England and known from around 90 sites (3).

You can view distribution information for this species at the National Biodiversity Network Gateway.
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Shining ram's-horn snail habitat

Inhabits ponds and drains of grazing marshes with unpolluted, often calcareous water, preferentially choked with a rich aquatic flora in an advanced stage of plant succession(5).

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Shining ram's-horn snail status

Listed as Endangered on the GB Red List (RDB1) (3).

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Shining ram's-horn snail threats

Although the precise causes of the decline of this species are not understood, the main threats are likely to be eutrophication resulting from fertiliser run-off, ditch clearance, and conversion of grazing land to arable, and the resulting reduction in the water table (3).

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Shining ram's-horn snail conservation

The Species Action Plan produced under the UK Biodiversity Action Plan (UK BAP) for the shining ram's-horn snail aims to promote the increase and expansion of existing populations and promote research into the ecology of the species (3).

The UK Biodiversity Action Plan for this species is available at UK BAP.
View information on this species at the UNEP World Conservation Monitoring Centre.
There may be further information about this species available via the National Biodiversity Network Gateway.
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Authentication

Information authenticated by Shelagh Wilson of the Environment Agency.
http://www.environment-agency.gov.uk/

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Glossary

Aperture
Opening in the end or area of a mollusc shell out of which soft, internal body parts may emerge.
Calcareous
Containing free calcium carbonate, chalky.
Eutrophication
Nutrient enrichment of aquatic or terrestrial ecosystems.
Succession
The progressive sequence of changes in vegetation types and animal life within a community that, if allowed to continue, result in the formation of a 'climax community' (the last stage in a succession where the vegetation reaches equilibrium with the environment).
Whorls
In animals, the spiral or convolutions in the shell of a snail. In plants, a set of leaves, flowers, or branches that spring from a stem at the same point and encircle it.
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References

  1. University of Michigan. Animal Diversity Web. (January 2002): http://animaldiversity.ummz.umich.edu/mollusca/gastropoda/lymnophila.html
  2. Wilson, S. (2002) Pers. Comm.
  3. UK BAP (January 2002): http://www.ukbap.org.uk
  4. The Environment Agency. (1998) Species Awareness leaflet: Snails. The Environment Agency, Bristol.
  5. A survey of the East Kent grazing marshes for the freshwater snail Segmentina nitida English Nature Research Report number 356, 2000.
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Image credit

Shining ram's-horn snail  
Shining ram's-horn snail

© Roger Key

Dr Roger Key
Tel: +44 (0) 1845 567 292
key_r_s@yahoo.co.uk

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