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

Ecology Biology unknown. The larvae probably develop in
soft fungi. Adults recorded within the period from July to
October (trapping samples overlap these months).
Status Only recently discovered and is not yet known
outside Britain. Not listed in Shirt (1987) or Falk (1991). It
was found singly at each site during extensive trapping
programmes so evidently has low population levels or
secretive behaviour. It is thus possibly under-recorded as a
result.
Threats Drainage of wetlands and damp woodland for
intensive forestry or agriculture.
Management and conservation Maintain stable water
levels and existing mosaic of vegetation on wetlands,
avoiding overgrazing or non-rotational cutting. Ensure that
litter layer on which fungus hosts may depend is retained.
Published sources Chandler (1994b).
RYMOSIA SETIGER
A fungus gnat LOWER RISK (Nationally Scarce)
Order DIPTERA
Family MYCETOPHILIDAE
Rymosia setiger Dziedzicki, 1910
Identification Keyed by Chandler (1994b); the male
genitalia were figured by Dziedzicki (1910, 1915).
Distribution Widespread in Scotland, with a few records
for North Wales and one for southern England:
Crowborough, Sussex (1906, 1922); Coed y Brenin,
Merionethshire (1975); Roxburghshire, Perthshire,
Aberdeenshire, Easterness, Banffshire, Elgin, East Ross,
East Sutherland.
Habitat Damp broad-leaved woodland.
Ecology Reared in Hungary from Ramaria formosa and a
Cortinarius species, in Estonia from Sarcodon imbricatus
and in Russia from Hygrophorus erubescens. A range of
soft terrestrial fungi is thus utilised. Adults recorded from
May to October.
Status A locally frequent Scottish species, especially in the
Highlands with some 24 post 1960 sites and the Welsh
record is also post 1960. Despite intensive recent recording
there have been no further English records since those cited
by Edwards (1941) from Sussex. Not listed in Shirt (1987).
Threats Clearance of damp woodlands for intensive
forestry or agriculture.
Management and conservation Maintain woodlands in a
natural state, ensuring the continuity of these habitats.
Avoid drainage or damage to litter layer or soil structure
which could affect terrestrial fungus hosts.
Published sources Edwards (1941).
RYMOSIA SPEYAE
A fungus gnat
Order DIPTERA
Rymosia speyae Chandler, 1994
VULNERABLE
Family MYCETOPHILIDAE
Identification Keyed by Chandler (1994b), who figured the
male genitalia.
Distribution Only three known localities: Cors Gyfelog, by
Afon Dwyfach, Caernarvonshire (26 May 1988, Holmes,
Boyce and Reed); Allanaquoich, Mar Lodge Estate,
Aberdeenshire (30 June and 23 August 2000, A. Godfrey);
Insh Marshes RSPB, Easterness (16 June 1982, W. Ely).
Habitat The Cors Gyfelog and Insh Marshes sites are both
open floodplain fens, of which the latter is a Carex
dominated poor fen. Allanaquoich is an open Betula
woodland with a high water table in the flood plain of the
River Dee.
Ecology Biology unknown. The larvae probably develop in
soft fungi.
Status Only recently discovered and not yet recorded
outside Britain. Not listed in Shirt (1987); this is the
Rymosia sp. nov. of Falk (1991). The widely separated sites
suggest that it is a secretive and undoubtedly underrecorded
species, but the few British records (and lack of
records from continental Europe) indicate it has small
population sizes. Combined with its association with
wetlands, the limited area of occupancy indicates
Vulnerable status.
Threats Drainage of wetlands for improved agriculture.
The hydrology of the Insh Marshes may be threatened by
river management schemes.
Management and conservation Maintain stable water
levels and retain existing vegetation structure, avoiding
overgrazing or non-rotational cutting and ensure that litter
layer on which fungus hosts may depend is not disturbed.
Published sources Chandler (1994b).
RYMOSIA SPINIPES
A fungus gnat LOWER RISK (Nationally Scarce)
Order DIPTERA
Family MYCETOPHILIDAE
Rymosia spinipes Winnertz, 1863
Identification Keyed by Chandler (1994b) and male
genitalia figured by Dziedzicki (1910, 1915).
Distribution Records widely dispersed in southern England
and several records from the north of Scotland: Devon,
Somerset, Dorset, Hampshire, Sussex, Surrey, Essex,
Berkshire, Oxfordshire, Suffolk, Cambridgeshire,
Gloucestershire; Perthshire, Aberdeenshire, Elgin,
Easterness, West Ross, East Ross.
Habitat Probably damp, mainly broad-leaved woodland and
the vicinity of woodland streams.
Ecology It develops in mainly terrestrial gill fungi, and has
been reared in Portugal from Tricholoma, Entoloma and
Inocybe species, in Estonia from Inocybe and in Russia
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