Trichosiopsis viaticella
Ordo: Diptera
Familia: Sciaridae
Genus: Trichosiopsis
Name
Trichosiopsis viaticella (Mohrig & Krivosheina, 1979) – Wikispecies link – ZooBank link
- Trichosia (Leptosciarella) viaticella Mohrig & Krivosheina, 1979[1]: 574-575, fig. 3
- Leptosciarella (Leptosciarella) viaticella (Mohrig & Krivosheina, 1979)[2]: 78-79, fig. 28
Type material
Holotype: ♂, 04.05.1976, leg. Gusakova, PWMP 4026
Type locality
Russia, Khabarovsk, Nature Reserve Khekhtsyr
Material studied
Finland: 1 ♂, Kb, Lieksa, Koivusuo Strict Nat. Res.: spruce/birch/aspen forest, Malaise trap, Jaschhof, 16.6.-15.07.2004, PKHH 6276; Germany: 1 ♂, Brandenburg, Wernsdorf, Mülldeponie, Werner, 14.04.1993, SDEI 2458 [as Leptosciarella viatica in Mohrig & Menzel (1997[2]: 75)].
Description (male)
Head. Eye bridge 4–5 rows of facets. LW-index of 4th antennal flagellar segment 2–2.3; neck 0.32–0.45 of segment width; Transition of basal part to neck pronounced. Colour of neck unicolour. Antennal hairs shorter than segment width, or as long as segment width; sparse; salient. Palps darkened; short, or normal; palpomeres 3. First palpomere thickened; with 4–6 bristles; with only some sparse sensillae. Second palpomere globular. Third palpomere as long as first segment. Thorax. Colour very dark. Notum unicolorous. Thoracic setae long and strong, or normal; dark. Mesonotum with some weaker central bristles. Posterior pronotum bare. Laterotergite bare. Legs. Colour brown. Hind coxae darkened. Hairs on fore coxae black. Front tibia apically with a patch of setae. Front tibial organ dark. Front tibial organ not bordered. Tibial setae on hind legs weak, inconspicuous, or normal, shorter than tibial width. Tibial spurs of equal length. Claws untoothed. Wings. Wings slightly darkened; reduced, with weakly developed anal lobe. 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 with macrotrichia; stM bare; cuA1 and cuA2 with a few macrotrichia, or bare; bM bare; r-m bare; bM:r-M 0.8–1; st-Cu:bM 0.3–0.5; r1:r 1.2–1.45; C:w 0.65–0.77. Halteres dark; of normal length. Abdomen. Abdominal setae strong and dense; dorsally dark; ventrally dark. Hypopygium concolour with abdomen; 0.55–0.7 × longer than wide. Base of gonocoxites with normal, weak hairs; gonocoxites narrowly separated, or 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; 1.9–2.2 × longer than wide; Inner margin concave; apex equally rounded. Apical tooth present; 1.9–2.3 × longer than broad; strong, or normal. Awl-like setae normal; on inner side of gonostyles absent. Megasetae on inner part of gonostylus absent. Whiplash-hair absent. Tegmen 0.55–0.68 × longer than broad; rectangular with rounded edges; with dark and strengthended edges; Central process absent. Length of aedeagus/hypopygium 34–45 %; Aeadeagal apical structure absent. Measurements. Body size 2.2–2.8 mm. Hind tibia 1.21–1.35 mm. Wing length 2.3–2.7 mm.
Diagnosis
Trichosiopsis viaticella is a dark, brachypterous species with nearly completely reduced macrotrichia on the posterior wing veins. In general aspect it is similar to Trichosiopsis viatica, which can be distinguished by the more numerous macrotrichia on the wing veins, the thicker gonostyles and the brighter legs. Another very similar species regarding the hypopygium and the reduction of macrotrichia is Trichosiopsis claviforceps, which otherwise has yellow legs, bright hairs on the fore coxae and a bright tibial organ. Most similar is Trichosiopsis reducta, which was previously treated as conspecific. Differential characters are the two-segmented palpi, the completely bare posterior wing veins and the more slender gonostyli.
Discussion
By the rounded gonostyles this species belongs to the viatica-complex of species and here to the subgroup of species with reduced macrotrichia on the wing veins.
Etymology
lat. viaticus = travelling; making reference to similarity to Trichosiopsis viatica
Ecology
The holotype of Trichosiopsis viaticella was bred from dead alder wood. The species is only rarely found, probably because of its low flight activity caused by the wing reduction. Tr. viaticella is nevertheless obviously widely distributed.
Distribution
Finland[3], Germany, Russia[1], Slovakia[4].
Images
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References
- ↑ 1.0 1.1 Mohrig, W.; Mamaev, B.; Krivosheina, N. 1979: Neue Arten holzverwertender Sciariden (Diptera) aus der UdSSR. Zoologische Jahrbücher, Abteilung für Systematik, Ökologie und Geographie der Tiere, 106, 572–588.
- ↑ 2.0 2.1 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.
- ↑ Vilkamaa, P.; Heller, K.; Hippa, H. 2013: New species of Sciaridae (Diptera) to the Finnish fauna. Sahlbergia, 19(1–2), 20–29.
- ↑ Rudzinski, H.-G. 2009: Die Trauermücken des Poľana Biosphären-Reservats (Diptera: Sciaridae). Casopis Slezskeho zemskeho muzea, serie A, 58, 39-46.
