Part 2: Nematocera and Aschiza not dealt with by Falk (1991) - JNCC

ALLODIA WESTERHOLTI
A fungus gnat
DATA DEFICIENT
Order DIPTERA
Family MYCETOPHILIDAE
Allodia westerholti Caspers, 1980
Identification This was described and the male genitalia
figured under the name Allodia westerholti Caspers by
Caspers (1980). It was synonymised with A. retracta
Plassmann by Caspers & Plassmann (1986), when it was
thought that the holotype of A. retracta was conspecific
with A. westerholti. However, the genitalia figure by
Plassmann (1977) applied to a different species and Caspers
(1996) found that retracta correctly applied to that species,
restoring the name westerholti.
Distribution Known as British only from five records:
Eyeworth Wood, New Forest, Hampshire (16 May 2002, I.
Perry); Box Hill, Surrey (11 July 1992, P.J. Chandler);
Ashridge Estate, Hertfordshire (8 July 1999, P.J. Chandler);
Workman’s Wood NNR (11 October 1979, I.F.G. McLean)
and Chedworth (12 October 1979, A.E. Stubbs),
Gloucestershire.
Habitat Broad-leaved woodland, predominantly Beech
(Fagus) on chalk or limestone.
Ecology Biology unknown. The larvae probably develop in
soft fungi. Adults recorded in May, July and October.
Status A poorly known species. Included in Chandler
(1998b) and formally added to the British list by Chandler
(2001a). Currently there is inadequate information to assess
the risk of extinction. Not listed in Shirt (1987). Status
revised from RDB 2 in Falk (1991), whre it was included as
Allodia retracta.
Threats Clearance of woodland for agriculture or intensive
forestry. Removal of any dead wood which might support
its fungus hosts.
Management and conservation Ensure continuity of forest
habitat with all successional stages including dead wood,
especially where it is in damp shaded situations.
Published sources Chandler (2001a).
ANACLILEIA DISPAR
A fungus gnat LOWER RISK (Nationally Scarce)
Order DIPTERA
Family MYCETOPHILIDAE
Anaclileia dispar (Winnertz, 1863)
Identification Keyed by Hutson, Ackland & Kidd (1980).
Distribution Scattered records throughout Britain: Devon,
Hampshire, Sussex, Kent, Staffordshire, Derbyshire,
Cheshire, Lancashire, Yorkshire, Westmorland;
Cardiganshire (Figyn Blaenbrefi); Perthshire, Elgin
(wooded sites in the Spey Valley) and Clyde Isles (Arran).
Habitat Most records are from woodland but those from
Westmorland (Moor House NNR and Deer Dyke Moss)
relate to open moorland.
Ecology Biology of this genus unknown; related genera
develop in fungi or rotten wood. Adults recorded from
March to June.
Status Very local with ten widely scattered post 1960 sites,
but usually found singly suggesting that under recording is
likely.
Threats Clearance of woodland for agriculture or intensive
forestry; removal of dead wood which may be a
requirement.
Management and conservation Maintain continuity of
woodland habitats with all successional stages, including
any dead wood. Unclear concerning open habitats other than
maintaining existing mosaic of vegetation.
Published sources Chandler (1991); Coldwell (2001);
Edwards (1921, 1925); J. Edwards (1951); Emley (1992).
ANATELLA ALPINA
A fungus gnat
Order DIPTERA
Anatella alpina Plassmann, 1977
DATA DEFICIENT
Family MYCETOPHILIDAE
Identification The male genitalia were figured by Caspers
(1984a).
Distribution Possibly a northern and western species with
six widely scattered localities known: Ivybridge, Devon (11
October 1980, P.J. Chandler); Sheephouse Wood (23
August 2001) and Little Don Valley (1 October 2003),
Yorkshire (J. Coldwell); Cors Caranod, Cardiganshire (23
July 1987, Holmes, Boyce and Reed); Aber Valley,
Caernarvonshire (7 July 1987, P.J. Chandler); Pass of
Killiecrankie, Perthshire (1 September 1987, P.J. Chandler).
Habitat Most sites, including one in Ireland, are deep
gorges in broad-leaved woodland. The Cardiganshire site,
however, consists of bog and fen, the precise area being
Equisetum fen.
Ecology Biology unknown. The larvae probably develop in
soft fungi which may be lignicolous. Adults recorded from
July to October.
Status A small obscure species described from the German
Alps, which was found in Ireland in 1986 before being
recognised to occur in Britain. Currently there is inadequate
information to assess the risk of extinction. Not listed in
Shirt (1987) and as RDB 3 in Falk (1991).
Threats Clearance of woodland for intensive forestry,
although sites in deep gorges are less likely to be
vulnerable. Drainage of associated areas and removal of
rotten wood.
Management and conservation Maintain habitats in a
natural state, avoiding drainage or disturbance of shaded
streams.
Published sources Chandler (1987a, 1994a).
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