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Cylindrical Whorl Snail Truncatellina cylindrica

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County Recorder

Large-mouthed Valve Snail Valvata macrostoma

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45

21

Narrow-mouthed Whorl Snail Vertigo angustior

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22

9

Geyer’s Whorl Snail Vertigo geyeri

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1

1

County Recorder, EA

Desmoulin’s Whorl Snail Vertigo moulinsiana

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18

9

County Recorder, EA

RDB Species. Found at Thetford in 1952 but not since. Associated with dry, calcareous grassland and occasionally on sand dunes. Marked decline in UK – Habitat loss and degradation. New to national list of BAP priority species 2007 RDB Species. Quite widespread in suitable habitat. Associated with coastal and floodplain grazing marshes. Internationally threatened – Habitat loss, degradation and pollution. New to national list of BAP priority species 2007 RDB Species. Current UK Species Action Plan. New sites discovered in 2006. Occurs in damp, short grass and moss on marshes, including salt marshes, or among flood debris. Internationally threatened - The habitat of this snail is very vulnerable to changes in hydrological conditions, reduced grazing pressure and physical disturbance. Norfolk Action Plan published December 1998, revised January 2003. Discovered in Scarning Fen, Norfolk in 2005 (Holyoak) and confirmed in 2006.. RDB Species. Current UK Species Action Plan. Occurs only on tufa-depositing springs and was previously known from only two sites in England and one in Wales. It has also recently been found at sites in Scotland. Internationally threatened - Habitat is vulnerable to destruction from changes in hydrology or grazing levels, or trampling by humans and animals. Norfolk Action Plan published December 1998, revised January 2003.

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