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

Ecology Biology unknown. Members of this genus usually
develop on the surface of fungi encrusting dead wood.
Adults recorded from April to October.
Status A very local old woodland species with most sites,
33 of the 34 known, being post 1970 possibly due to an
enhanced level of recording in recent years.
Threats Clearance of old broad-leaved woodland for
intensive forestry or agriculture. Removal of old trees or
dead wood which may support larval development.
Management and conservation Maintain woodlands in a
natural state, retaining any old or diseased trees and dead
wood, especially in moist shaded situations, ensuring
continuity of these resources in the future.
Published sources Chandler (1992c); Coldwell 2003;
Gagné (1981).
TRICHONTA FLAVICAUDA
A fungus gnat
DATA DEFICIENT
Order DIPTERA
Family MYCETOPHILIDAE
Trichonta flavicauda Lundström, 1914
Identification Keyed and male genitalia figured by Gagné
(1981).
Distribution Only known as British from old records at
Nethy Bridge, Elgin (June 1908, D. Sharp and 5 June 1923,
J.J.F.X. King) and from one recent record: Dubh Ghleann,
Mar Lodge Estate, Aberdeenshire (15 June 2003, P.J.
Chandler).
Habitat The recent record was from remnant Caledonian
pine forest with no regeneration due to high levels of deer
grazing.
Ecology Biology unknown. Members of this genus usually
develop on fungi encrusting dead wood.
Status A poorly known species with only one recent record.
Currently there is inadequate information to assess the risk
of extinction. Status revised from RDB 1 in Shirt (1987) and
Falk (1991).
Threats Uncertain other than clearance of woodland for
intensive forestry or agriculture and removal of old trees or
dead wood, which may support larval development.
Management and conservation Retain any dead wood and
old or diseased trees, ensuring continuity of these resources
into the future.
Published sources Edwards (1915, 1925).
TRICHONTA FRAGILIS
A fungus gnat LOWER RISK (Nationally Scarce)
Order DIPTERA
Family MYCETOPHILIDAE
Trichonta fragilis Gagné, 1981
Identification Keyed and the male genitalia figured by
Gagné (1981).
Distribution Records are scattered across England, mainly
in the south but also one site in Wales and several from the
Highlands of Scotland: Devon, Somerset, Wiltshire, Surrey,
Hertfordshire, Berkshire, Buckinghamshire, Suffolk,
Norfolk, Cambridgeshire, Northamptonshire,
Gloucestershire, Cheshire, Yorkshire, Cumberland,
Breconshire, Perthshire, Aberdeenshire, Elgin, Easterness
and East Sutherland.
Habitat Damp broad-leaved woodland.
Ecology Biology unknown. Members of this genus usually
develop in fungi encrusting dead wood Adults recorded
from April to October.
Status A previously overlooked species, only recognised in
Britain since its description from a few individuals found at
widely scattered locations in Europe. It is already known
from 30 sites of which 28 are post 1970, and it has also been
found in Ireland. Not listed in Shirt (1987) and status
revised from RDB 3 (Falk 1991).
Threats Clearance or drainage of damp woodland for
agricultural or forestry purposes. Removal of any dead
wood and old or diseased trees which may support
development sites.
Management and conservation Maintain woodlands in a
natural state, retaining any old trees and dead wood,
especially in damp shaded situations, ensuring the
continuity of these habitats in the future.
Published sources Chandler (1992c, 1992d); Coldwell
2003; Judd (1999a); Perry & Langton (2000).
TRICHONTA FUSCA
A fungus gnat
Order DIPTERA
Trichonta fusca Landrock, 1918
DATA DEFICIENT
Family MYCETOPHILIDAE
Identification Keyed and the male genitalia figured by
Gagné (1981).
Distribution Only a single known site in Britain: Monks
Wood NNR, Huntingdonshire (12 and 19 June 1972, taken
in suction traps operated by M.W. Service).
Habitat Damp broad-leaved woodland.
Ecology Biology unknown. Members of this genus develop
on fungi encrusting dead wood.
Status A poorly known species which has not been
rediscovered since the initial record from one site which is a
National Nature Reserve. It is otherwise recorded from
Finland and Hungary. Currently there is inadequate
information to assess the risk of extinction. Status revised
from RDB 1 in Shirt (1987) and Falk (1991).
Threats Clearance of damp woodland for intensive forestry
or agriculture. Removal of old trees and dead wood on
which it may depend for development.
Management and conservation Maintain woodlands in a
natural state, retaining any old or diseased trees and dead
wood, especially in damp shaded situations, ensuring the
continuity of these resources in the future.
Published sources Cole & Chandler (1979); Gagné (1981).
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