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

Threats Clearance of woodland for intensive forestry or
agriculture. Removal of any dead wood and old or decayed
trees which may support fungus hosts.
Management and conservation Maintain woodlands in a
natural state, with old trees and dead wood, ensuring their
continuity into the future.
Published sources Edwards (1925, 1941).
MYCOMYA FREQUENS
A fungus gnat LOWER RISK (Nationally Scarce)
Order DIPTERA
Family MYCETOPHILIDAE
Mycomya frequens Johannsen, 1910
Identification The male genitalia were figured by Väisänen
(1984) and Chandler (1992b).
Distribution English sites are only from Norfolk (ten sites,
1988 to 1990; Thompson Common, 2004), but it is widely
distributed in Wales (1987 to 1989: one site each in
Pembrokeshire, Cardiganshire and Caernarvonshire; five
sites in Anglesey) and there are four known sites in
Scotland: Lochmaben, Dumfriesshire (1979); Lochan an
Daimh, Perthshire (1995); Wartle Moss, Aberdeenshire
(1993); Insh Marshes RSPB, Easterness (1990).
Habitat Fens including calcareous flushes and Salix carr on
floating fen but also acidic basin mires. Both open and more
or less wooded sites are recorded.
Ecology Biology unknown. The larvae of this genus have
been reared from fungi or associated with fungi growing on
rotten wood and are web spinners, living on the surface of
the substrate. Adults recorded from June to December.
Status Only recently recognised in Britain; it was initially
confused with the similar species Mycomya maura
(Walker), which is common in southern woodlands in the
spring but it evidently has a different geographical
distribution in Britain, as well as differences in habitat and
phenology. Not listed in Shirt (1987) or Falk (1991).
Threats Drainage of wetlands for agriculture or forestry;
overgrazing or non-rotational cutting of fen vegetation.
Management and conservation Maintain stable water
level and mosaic of fenland and carr vegetation. Restrict
grazing and ensure that any cutting is carried out on rotation
without damage to litter layer which may provide larval
development sites.
Published sources Chandler (1992b).
MYCOMYA FUSCATA
A fungus gnat LOWER RISK (Near Threatened)
Order DIPTERA
Family MYCETOPHILIDAE
Mycomya fuscata (Winnertz, 1863)
Identification Keyed by Hutson, Ackland & Kidd (1980).
Distribution Recorded from a small number of sites in the
Scottish Highlands: Luibeg, Mar Lodge Estate,
Aberdeenshire (2000); Aviemore (1903), Logie (1903),
Nethy Bridge (1906), Craigellachie NNR (1966), Granish
(1966) and Dorback Burn (1966), Elgin; Dingwall, East
Ross (1909). There is a more recent unconfirmed record
from Milton Lockhart Wood SSSI, Lanarkshire (1980).
Habitat Broad-leaved woodland at some sites, perhaps
mixed woodland at others.
Ecology Biology unknown. The larvae of this genus have
been reared from fungi or associated with fungi on dead
wood and are web spinners, living on the surface of the
substrate. Adults recorded in August and September.
Status A very restricted species, which was evidently well
established in the Spey Valley in the past, but with no
records for that area since 1966, the only more recent record
being from the Braemar area. This is possibly because its
flight period is a less worked time of year in that region.
Threats Clearance of native woodland for intensive forestry
or agriculture. Removal of any dead wood and old or
diseased trees which might support suitable fungi.
Management and conservation Maintain woodland in a
natural state, retaining any old trees or dead wood, ensuring
continuity of these habitats in the future.
Published sources Edwards (1941); Hutson, Ackland &
Kidd (1980); Kidd & Ackland (1970).
MYCOMYA GRISEOVITTATA
A fungus gnat LOWER RISK (Near Threatened)
Order DIPTERA
Family MYCETOPHILIDAE
Mycomya griseovittata (Zetterstedt, 1852)
Identification Keyed by Hutson, Ackland & Kidd (1980) as
Mycomya clavigera (Lundström, 1912) and listed under this
name by Shirt (1987) and under both names by Falk (1991).
The earlier name Mycomya fasciata (Zetterstedt, 1838) was
used by Väisänen (1984) but Chandler (1987b) indicated
this to be a homonym, so use of the present name became
necessary.
Distribution A small number of records from Scotland and
one from northern England: Dun Fell (within Moor House
NNR), Westmorland (1976); Glen Lochay Woods (1932)
and Fealar Gorge (1999), Perthshire; Aviemore, Elgin
(1913, 1934); Glen Einich (1934), Glen Coiltie (1994, 1997)
and Dorback Burn, Abernethy Forest NNR (1991),
Easterness; Arran, Clyde Isles (1952).
Habitat Upland woodland and open moorland. It was found
in a pitfall trap at 650m at Dun Fell. At Divach Falls it was
in the Alder (Alnus) wood below the Falls.
Ecology Biology unknown. An old record of M. fasciata
from Ganoderma almost certainly applies to another
species. The larvae of this genus have been reared from
fungi or associated with fungi on dead wood and are web
spinners, living on the surface of the substrate. Adults
recorded in May and June.
Status A rather restricted species with five post 1960
records but probably under-recorded because of the
predominant habitats. Status revised from RDB 2 (Shirt
1987).
Threats Clearance of native woodland and afforestation of
open sites.
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