Leptosciarella yerburyi

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Ordo: Diptera
Familia: Sciaridae
Genus: Leptosciarella


Leptosciarella yerburyi (Freeman, 1983)Wikispecies link

  • Trichosia (Leptosciarella) yerburyi Freeman, 1983: 163[1]

Type material

Holotype ♂, in BMNH, leg. Yerbury, 24.06.1905.

Type locality

Great Britain, Scotland, Banffshire, Ballindalloch

Additional material examined

Germany: 1 ♂, Bavaria, Königsee, National Park, beech forest, Heller, 30.05.1999, PKHH 2798; 1 ♂, Brandenburg, Kerkwitz, Traubendorfer Grenzlauch, Malaise trap, Mohrig, 25.06.1999, PWMP 1640; 1 ♂, Mecklenburg-Vorpommern, Neuendorf-Breechen near Gützkow, Groth, 03.06.1984, PWMP 1718; 1 ♀, Schleswig-Holstein, Mönkeberg, woodland at Mönkeberg lake, sweep netting, Heller, 25.05.2012, PKHH 8009; Finland: 1 ♂, Karkalohja, Ab, Karkakinnien, Stahfs, 02.07.2004, MZH 9194; 4 ♂, Outokumpu, Kb, Lake Sysmäjärvi: birch/alder forest, sweep netting, Jaschhof, 18.06.2004, PKHH 6334, PASS 180, ZSMC 2435. 2436; 5 ♂, Savonlinna, Sa, secondary mixed birch/spruce/pine/aspen forest, sweep netting, Jaschhof, 19.06.2004, PKHH 6287, 6289, 6290, MZH 9035-9035; Hungary: 2 ♂, Szilvasvarad, Heves, Galium-Fagaceae forest, sweep netting, Rulik, 21.05.1998, PWMP 1719-1720; Sweden: 1 ♂, Darlana, Gonäs, Darlanas län, garden, Malaise trap, K.D. Hilger & E. Hilger, 10.-18.07.2000, PKHH 3372; 1 ♂, Småland, Bäckebo, Kalmar Län, Grytsjöns naurreservat, Old aspen forest in boulder terrain, Malaise trap, Swedish Malaise Trap Project, 18.5.-15.06.2006, NHRS 2913; 4 ♂, Gränna, Jonköpings län, Lönnemålen, next to old cellar; Norway spruce forest with big harvested ashes, Malaise trap, Swedish Malaise Trap Project, 10.-24.09.2003, NHRS 3169-3170, 4088-4089; 7 ♂, Uppland, Biskops-Arnö, Uppsala län, northern beach, elm grove, Malaise trap, Swedish Malaise Trap Project, 20.6.-18.07.2005, PKHH 7375, NHRS 4552; Switzerland: 3 ♂ 1 ♀, Zurich, Sihlwald, photoeclector, Schiegg, 24.5.-19.06.1996, PKHH 2385, 2386, 2492; Ukraine: 2 ♂, Rakhiv, Krivosheina, 14.06.1966, PWMP 1717.

Description (male)

Head. Eye bridge 5–6 rows of facets. LW-index of 4th antennal flagellar segment 1.9–2.2; neck 0.35–0.45 of segment width; Transition of basal part to neck pronounced. Antennal hairs shorter than segment width; sparse; salient. Palps darkened; normal; palpomeres 3. First palpomere thickened; with 13–20 bristles; with only some sparse sensillae. Second palpomere shortly oval. Third palpomere as long as first segment. Thorax. Colour very dark. Notum unicolorous. Thoracic setae long and strong; dark. Mesonotum with some weaker central bristles. Posterior pronotum bare. Laterotergite bare. Legs. Colour yellow, or yellow-brown. Hind coxae darkened. Hairs on fore coxae black. Frontal tibia with a patch of setae. Front tibial organ dark. Front tibial organ not bordered. Tibial setae on hind legs normal, shorter than tibial width. Tibial spurs of equal length. Claws untoothed. Wings. Wings slightly darkened, or very dark; of normal shape. Wing membrane without macrotrichia. Wing venation strong and clearly delimited. M-fork of normal shape. R1 inserting clearly after base of m-fork; posterior veins with macrotrichia; stM mainly with macrotrichia; cuA1 and cuA2 mainly with macrotrichia; bM bare; r-m mostly setose; bM:r-M 0.48–0.65; st-Cu:bM 0.5–0.65; r1:r 1.6–1.75; C:w 0.75–0.85. Halteres dark; of normal length. Abdomen. Abdominal setae strong and dense; dorsally dark; ventrally dark. Hypopygium concolour with abdomen; Length/Width 0.6–0.75 longer than wide. Base of gonocoxites with strong setae; gonocoxites broadly separated; inner margin of gonocoxites normally U-shaped; inner part of hypopygium scarcely setose; elongated setae on valves of hypopygium absent. Gonostylus elongate; 2.4–2.6 × longer than wide; Inner margin concave; apex tapered, or equally rounded. Apical tooth present; 1.75–1.95 × longer than broad; strong. Awl-like setae long, or normal; below apex present. Megasetae on inner part of gonostylus absent. Tegmen 0.6–0.75 × longer than broad; rectangular with rounded edges; normal; Central process absent. Length of aedeagus/hypopygium 24–34 %; Aeadeagal apical structure present. Measurements. Body size 4–5.2 mm. Wing length 3.8–4.8 mm.

Remark: The two observed female specimens differ from the males by not having a thickened first palp segment and by possessing some bristles on the pleurotergite.


Leptosciarella yerburyi is a very large and dark species and therefore quite easy to distinguish from other species of Leptosciarella. Additionally the bare postpronotum (unusual for large species), the thickened first palp segment and the dark and strong setae at the front coxae make the identification this species unproblematic. The shape of the gonostyles resembles those of Leptosciarella juniperi.


The species was named after the collector, J.W. Yerbury.


Not known in detail, mainly found in forests.


Austria[2], Czech Republic[3][4], Finland[5], Germany[2][6], Great Britain[1][7][2], Hungary[8], Ireland[2][7], Latvia[2], Slovakia[2], Sweden[9], Switzerland[10], Ukraine[2].



  1. 1.0 1.1 Freeman, P. 1983: Revisionary notes on British Sciaridae (Diptera). Entomologist’s Monthly Magazine, 119, 161–170.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Mohrig, W.; Menzel, F. 1997: Revision der paläarktischen Arten von Trichosia Winnertz sensu Tuomikoski, 1960 (Diptera, Sciaridae). – Teil II. Gattungen Leptosciarella Tuomikoski, 1960 und Trichodapus gen. nov. Studia dipterologica, 4(1), 41–98.
  3. Menzel, F.; Mohrig, W.; Barták, J. 2000: Sciaridae. In: J. Vanhara & M. Barták (Eds.), Diptera in an industrially affected region (North-Western Bohemia, Bilina and Duchcov Environs), I, Folia Facultatis Scientiarum Naturalium Universitatis Masarykianae Brunensis (104). pp. 73-81.
  4. Rudzinski, H.-G. 1994: Trauermückenfunde aus Nord-Mähren (Diptera: Sciaridae). Entomological Problems, 25, 11-23.
  5. Vilkamaa, P.; Salmela, J.; Hippa, H. 2007: Black fungus-gnats in deciduous forest habitat in northern Europe, with the description of Bradysia arcula sp. n. (Diptera: Sciaridae). Entomologica Fennica, 18(4), 226-231.
  6. Menzel, F.; Heller, K. 2006: Trauermücken (Diptera: Sciaridae) aus dem Nationalpark „Hainich“ (Thüringen) nebst der Beschreibung von Scatopsciara andrei Menzel spec. nov. Studia dipterologica, 13(1), 45–59.
  7. 7.0 7.1 Menzel, F.; Smith, J.E.; Chandler, P. 2006: The sciarid fauna of the British Isles (Diptera: Sciaridae), including descriptions of six new species. Zoological Journal of the Linnean Society, 146, 1-147. PDF
  8. Rulik, B.; Mohrig, W.; Jaschhof, M. 2001: Trauermücken (Diptera: Sciaridae) und freilebende Gallmücken (Diptera: Cecidomyiidae: Lestremiinae) aus Ungarn. Mit Bemerkungen zur Corynoptera tridentata-Gruppe. Folia Entomologica Hungarica, 62, 231-245.
  9. Heller, K.; Vilkamaa, P.; Hippa, H. 2009: An annotated check list of Swedish black fungus gnats (Diptera, Sciaridae). Sahlbergia, 15(1), 23-51.
  10. Schiegg, K.; Obrist, M.; Duelli, P.; Merz, B. et al. 1999: Diptera and Coleoptera collected in the Forest Reserve Sihlwald ZH. Mitteilungen der Schweizerischen Entomologischen Gesellschaft, 72, 289–302.