Difference between revisions of "Leptospina atricha"

Latest revision as of 18:20, 1 January 2021

Taxonavigation

Ordo: Diptera
Familia: Sciaridae
Genus: Leptospina

Name

Leptospina atricha (Tuomikoski, 1960) – Wikispecies link – ZooBank link

• Trichosia (Leptosciarella) atricha Tuomikoski, 1960^[1]: 27, fig. 4c, 4i, 4l, 5e
• Leptosciarella (Leptospina) atricha (Tuomikoski, 1960)^[2]: 84-85, fig. 34

Type material

Lectotype: ♂, 30.07.1958, leg. Tuomikoski in MZH

Type locality

Finland, KemL, Sodankylä, Korvanen

Material studied

Finland: 1 ♂, Kn, Kuhmo, Elimyssalo Nat. Res.: spruce/birch/aspen forest, sweep netting, Jaschhof, 6.-07.08.2004, PKHH 6214; Sweden: 1 ♂, Ångermanland, Skuleskogen National Park, Västernorrlans län, Langra: brook ravine in mixed forest, Malaise trap, Swedish Malaise Trap Project, 9.-23.08.2004, NHRS 1227; 2 ♂, Darlana, Orsa, Wald- und Moorlandschaft Orsa-Grönklitt, sweep netting, Heller, 07.08.2006, PKHH 4977/4978; 5 ♂, Hälsingland, Hamra Nationalpark, Gävleborgs län, Alter Kiefern-Fichtenwald, sweep netting, Heller, 03.08.2006, PKHH 4994-4996, PASS 111; 3 ♂, Härjedalen, Nyvallen, Nyvallens fäbod: alpine birch and spruce wood, Malaise trap, Swedish Malaise Trap Project, 4.7.-04.08.2004, NHRS 1672/1673/1774; 1 ♂, Lule lappmark, Gällivare, Ätnovara försökspark, Pelttovaara: Vaccinium vitis-idaea pine wood, Malaise trap, Swedish Malaise Trap Project, 29.7.-13.08.2004, NHRS 1360; 1 ♂, Lycksele lappmark, Laxnäs, Janzon, 11.-12.07.1992, NHRS 808; 22 ♂, Pite lappmark, Arjeplog, Kunglsleden SW Jäkkik; subalpine birch forest, Malaise trap, Jaschhof & Jaschhof, 10.7.-12.08.2005, PKHH 5882; NHRS 1013/1014, ZSMC 2394/2395; 8 ♂, Arvidsjaur, Norrbottens län, Reivo Nat. Res.; swampy spruce/pine forest, Malaise trap, Jaschhof & Jaschhof, 11.7.-10.08.2005, PKHH 5902.

Description (male)

Head. Eye bridge 3–4 rows of facets. LW-index of 4^th antennal flagellar segment 2.3–2.6; neck 0.32–0.42 of segment width; Transition of basal part to neck pronounced. Colour of neck unicolour. Antennal hairs shorter than segment width; dense; salient. Palps darkened; normal; palpomeres 3. First palpomere of normal shape; with 1–3 bristles; with only some sparse sensillae. Second palpomere shortly oval. Third palpomere shorter than first segment, or as long as first segment. Thorax. Colour reddish. Notum unicolorous. Thoracic setae weak; darkened, or bright. 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, or very strong, as long or longer longer 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 with a few setae; bM:r-M 0.7–0.95; st-Cu:bM 0.61–0.82; r₁:r 1.1–1.4; C:w 0.42–0.57. Halteres dark; of normal length. Abdomen. Abdominal setae dorsally white; ventrally white. Hypopygium concolour with abdomen; 0.65–0.78 × 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 bare, or scarcely setose; elongated setae on valves of hypopygium absent. Gonostylus elongate; 2.3–2.6 × longer than wide; Inner margin straight; apex with one obtuse angle. Apical tooth present; 3.1–4 × 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 0.65–0.76 × longer than broad; equally rounded; with dark and strengthened edges; Central process absent. Length of aedeagus/hypopygium 13–25 %; Aeadeagal apical structure present. Measurements. Body size 2.1–2.6 mm. Hind tibia 0.95–1.15 mm. Wing length 2.1–2.45 mm.

Diagnosis

Leptospina atricha is easily recognizable by the reddish colour of the thorax.

DNA Barcoding

The COI sequence is assigned to BIN BOLD:ACU4369 (average distance 0.05%, max. 0.16%, n=6, K2P: 12.68%).

Discussion

Le. atricha differs from all other European species by the transformation of the apical setae into stronger megasetae, the reason why it was placed in Leptospina (Mohrig & Menzel, 1997: 84^[2]). It is very similar to Leptospina nigrosetosa, with respect to the long and fine thoracic setae and the V-shaped structure at the hypopygial base.

Etymology

gr. ἀ- = without, θρίξ (thrix) = hair; making reference to the bare wing veins.

Ecology

Leptospina atricha is a typical species of boreal forests, often occurring together with Leptospina nudinervis but being less abundant.

Distribution

Finland^[1][3], Norway^[4], Sweden^[2][5].

Images

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

References

1. ↑ ^{1.0 1.1} Tuomikoski, R. 1960: Zur Kenntnis der Sciariden (Dipt.) Finnlands. Annales Zoologici Societatis Zoologicae Botanicae Fennicae “Vanamo”, 21, 1–164.
2. ↑ ^{2.0 2.1 2.2} 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. ↑ Salmela, J.; Vilkamaa, P. 2005: Sciaridae (Diptera) from central Finland: faunistics and taxonomy. Entomologica Fennica, 16, 287–300.
4. ↑ GBIF Leptospina atricha
5. ↑ Heller, K.; Vilkamaa, P.; Hippa, H. 2009: An annotated check list of Swedish black fungus gnats (Diptera, Sciaridae). Sahlbergia, 15(1), 23-51.