NORFOLK BIODIVERSITY ACTION PLAN SPECIES DATA AUDIT ...

Species Present
or
absent
in
Norfolk
Narrow-mouthed Whorl
Snail
Vertigo angustior
Round-mouthed Whorl Snail
Vertigo genesii
Geyer’s Whorl Snail
Vertigo geyeri
Cross Whorl Snail
Vertigo modesta
No. of
records in
database
No. of
1km
squares
recorded
since
1980
Possible other
sources
of data sets
59
Other survey
work
completed or
in progress
Comments
P 22 9 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.
A - - Not recorded in Norfolk
RDB Species. Current Species Action Plan.
A montane species occurring in only two
locations in Britain, one in Durham and the
other in Scotland.
Internationally threatened – Causes
unknown although this species would be
very susceptible to changes in hydrology or
an increase in trampling.
P ? ? County Recorder, EA Discovered in 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.
A - - Not recorded in Norfolk
Known from only a few sites in Scotland.
Declining – Very restricted distribution and
isolated population.
New to national list of BAP priority
species 2007