Leptospina nigrosetosa

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Taxonavigation

Ordo: Diptera
Familia: Sciaridae
Genus: Leptospina

Name

Leptospina nigrosetosa (Freeman, 1990) – Wikispecies link – ZooBank link

  • Corynoptera nigrosetosa Freeman, 1990[1]: 54, fig. 4, 5
  • Leptosciarella (Leptosciarella) nigrosetosa (Freeman, 1990)[2]: 100
  • Leptosciarella (Leptosciarella) truncatula (Mohrig & Menzel, 1997)[3]: 80, fig. 30

Type material

Holotype: ♂, 18.06.1978, leg. Cole in BMNH

Type locality

Great Britain, England, Cambridgeshire, Monk's Wood National Nature Reserve

Material studied

France: 1 ♂, Marais de Lavours, Foret, Malaise trap, Withers, 11.-18.06.2009, PPWM 43; Germany: 2 ♂ 1 ♀, Mecklenburg-Vorpommern, Abtshagen, Laubwald: Erle, Esche, Buche, Eiche, sweep netting, Jaschhof, 05.06.1995, PKHH 5330/5331, PWMP 5332; 1 ♂, Schleswig-Holstein, Winnemark, Nixenburg, Buchen-Mischwald, sweep netting, Heller, 12.05.2008, PKHH 6359; Sweden: 1 ♂, Södermannland, Nämdö, Krokudden, Krokvik, spruce and pine forest, Malaise trap, Swedish Malaise Trap Project, 5.7.-07.08.2008, NHRS 4255; 11 ♂, Södertälje, Tullgarns näs, Rävsalaviken, mixed forest next to pasture, Malaise trap, Swedish Malaise Trap Project, 16.6.-17.07.2005, PKHH 7406; 1 ♂, Uppland, Stockholm, Djurgården Park, Malaise trap, Heinakroon, 13.6.-04.07.1994, NHRS 486; 1 ♂, Älvkarleby, Batfors, pine forest with blueberry, Malaise trap, Swedish Malaise Trap Project, 27.6.-01.07.2004, PKHH 7447; 28 ♂, Öland, Skogsby, Gamla Skogsby (Kalkstad) "diversitetsängen", meadow with bushes, Malaise trap, Swedish Malaise Trap Project, 20.5.-28.06.2006, PKHH 6590/6591, NHRS 2294-2304/2443-2445/2520-2522/2583-2592, PASS 190.

Description (male)

Head. Eye bridge 4 rows of facets. LW-index of 4th antennal flagellar segment 1.9–2.2; neck 0.31–0.41 of segment width; Transition of basal part to neck pronounced. Colour of neck unicolour. Antennal hairs shorter than segment width; sparse; salient. Palps darkened; normal; palpomeres 3. First palpomere of normal shape; with 2–3 bristles; with only some sparse sensillae. Second palpomere shortly oval. Third palpomere as long as first segment. Thorax. Colour reddish. Notum unicolorous. Thoracic setae long and strong; dark. Mesonotum with some weaker central bristles. Posterior pronotum setose. Postpronotal setae 1–3; fine. Laterotergite bare. Legs. Colour yellow. Hind coxae of same colour as femora. Hairs on fore coxae bright. Front tibia apically 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; of normal shape. Wing membrane without macrotrichia. Wing venation weak, with faint m-base. M-fork of normal shape. R1 inserting clearly before base of m-fork; posterior veins bare; bM bare; r-m bare, or with a few setae; bM:r-M 0.85–1; st-Cu:bM 0.3–0.4; r1:r 0.96–1.25; C:w 0.5–0.6. Halteres dark; of normal length. Abdomen. Abdominal setae strong and dense; dorsally dark; ventrally of different colour. Hypopygium concolour with abdomen; 0.65–0.85 × longer than wide. Base of gonocoxites with normal, weak hairs; gonocoxites forming an inverse V; inner margin of gonocoxites normally U-shaped; inner part of hypopygium scarcely setose; elongated setae on valves of hypopygium absent. Gonostylus elongate; 2.4–2.7 × longer than wide; Inner margin straight, or convex; apex bulbous. Apical tooth present; 3–3.5 × longer than broad; strong. Awl-like setae long; on inner side of gonostyles present apically. Megasetae on inner part of gonostylus absent. Whiplash-hair absent. Tegmen 0.62–0.73 × longer than broad; equally rounded; with dark and strengthended edges; Central process absent. Length of aedeagus/hypopygium 13–25 %; Aeadeagal apical structure present. Measurements. Body size 2.5–2.9 mm. Hind tibia 1.1–1.35 mm. Wing length 2.3–2.7 mm.

Diagnosis

Leptospina nigrosetosa is a small species with elongate gonostyli and lacking macrotrichia on the posterior wing veins. It is very similar to Leptospina truncata, which can be distinguished by the completely bright body hairs and the apical less bulged gonostyli with not so strongly developed awl-like setae.

DNA Barcoding

The COI sequence is assigned to BIN BOLD:ADR2528 (n=1, K2P: 11.74%).

Discussion

Le. nigrosetosa belongs to a group of mostly boreal species with reduced macrotrichia on the wings and a V-shaped bright structure at the base of the gonostyli. Le. nigrosetosa was originally not recognized as belonging to Leptospina, but described as Corynoptera because of the missing macrotrichia on the posterior wing veins. Then it was treated as a synonym of Leptosciarella truncata by Mohrig & Menzel (1997[3]: 80) and the species was redescribed as Leptosciarella truncatula.

Etymology

lat. niger = black, seta = bristle; making reference to the strong, black body hairs.

Ecology

Trichosiopsis nigrosetosa is a species of Northern and Central European forests and may be locally very abundant.

Distribution

France, Germany[3][4], Great Britain[1][2], Latvia[3], Norway[5], Sweden[6].

Images

Figure 1. Leptospina nigrosetosa female, habitus, scale 1 mm
Figure 1. Leptospina nigrosetosa female, habitus, scale 1 mm 
Figure 2. Leptospina nigrosetosa male, hypopygium, scale 0.1 mm
Figure 2. Leptospina nigrosetosa male, hypopygium, scale 0.1 mm 
Figure 3. Leptospina nigrosetosa male, gonostylus (ventral view), scale 0.1 mm
Figure 3. Leptospina nigrosetosa male, gonostylus (ventral view), scale 0.1 mm 
Figure 4. Leptospina nigrosetosa male, gonostylus (dorsal view), scale 0.1 mm
Figure 4. Leptospina nigrosetosa male, gonostylus (dorsal view), scale 0.1 mm 
Figure 5. Leptospina nigrosetosa male, aedeagal complex, scale 0.1 mm
Figure 5. Leptospina nigrosetosa male, aedeagal complex, scale 0.1 mm 
Figure 6. Leptospina nigrosetosa male, 4th antennal flagellar segment, scale 0.1 mm
Figure 6. Leptospina nigrosetosa male, 4th antennal flagellar segment, scale 0.1 mm 
Figure 7. Leptospina nigrosetosa female, palpus, scale 0.1 mm
Figure 7. Leptospina nigrosetosa female, palpus, scale 0.1 mm 
Figure 8. Leptospina nigrosetosa male, wing, scale 1 mm
Figure 8. Leptospina nigrosetosa male, wing, scale 1 mm 

References

  1. ↑ 1.0 1.1 Freeman, P. 1990: Notes on British Sciaridae (Diptera) with descriptions of three new species and of a species new to Britain. Entomologist’s Monthly Magazine, 126, 51–55.
  2. ↑ 2.0 2.1 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
  3. ↑ 3.0 3.1 3.2 3.3 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.
  4. ↑ Heller, K.; Menzel, F. 2011: Ergänzungen und Korrekturen zur Checkliste der Sciaridae (Diptera: Sciaroidea) Schleswig-Holsteins, Deutschland. Studia dipterologica, 17(1-2), 109–112.
  5. ↑ GBIF Leptospina nigrosetosa
  6. ↑ Heller, K.; Vilkamaa, P.; Hippa, H. 2009: An annotated check list of Swedish black fungus gnats (Diptera, Sciaridae). Sahlbergia, 15(1), 23-51.
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