Gabyella opaca
Ordo: Diptera
Familia: Sciaridae
Genus: Gabyella
Name
Gabyella opaca (Mohrig & Krivosheina, 1983) – Wikispecies link – ZooBank link
- Corynoptera opaca Mohrig & Krivosheina, 1983[1]: 2-5, fig. 2
- Leptosciarella (Leptosciarella) opaca (Mohrig & Krivosheina, 1983)[2]: 79 fig. 29
Type material
Holotype ♂, no 1556 in PWMP, leg. Antonova, 08.07.1975
Type locality
Russia, Khabarovsk Region, Nature Reserve Khekhtsyr
Description (male)
Head. Eye bridge 3–4 rows of facets. LW-index of 4th antennal flagellar segment 2.4–2.7; neck 0.3–0.45 of segment width; Transition of basal part to neck pronounced. Colour of neck unicolour. Antennal hairs longer than segment width; sparse; adjacent. Palps darkened; short; palpomeres 3. First palpomere thickened; with 1–3 bristles; with only some sparse sensillae. Second palpomere globular. Third palpomere as long as first segment. Thorax. Colour brown, or bright brown. 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 of same colour as femora. 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; reduced, with weakly developed anal lobe. Wing membrane without macrotrichia. Wing venation weak, with faint m-base. M-fork of normal shape. R1 inserting at or slightly before base of m-fork; posterior veins bare; bM bare; r-m bare; bM:r-M 0.9–1.15; st-Cu:bM 0.6–0.95; r1:r 2.1–2.4; C:w 0.58–0.7. Halteres dark; short, or of normal length. Abdomen. Abdominal setae strong and dense; dorsally dark; ventrally dark. Hypopygium concolour with abdomen; Length/Width 0.51–0.65 longer than wide. Base of gonocoxites with normal, weak hairs; gonocoxites broadly separated; inner margin of gonocoxites normally U-shaped, or broadly extended; inner part of hypopygium scarcely setose; elongated setae on valves of hypopygium absent. Gonostylus elongate; 2.05–2.4 × longer than wide; Inner margin straight; apex tapered. Apical tooth present; 1.7–2 × longer than broad; strong. Awl-like setae long; below apex numerous, reaching far beyond the tooth. Megasetae on inner part of gonostylus absent. Whiplash-hair absent. Tegmen 0.5–0.7 × longer than broad; rectangular with rounded edges; normal; Central process absent. Length of aedeagus/hypopygium 15–25 %; Aeadeagal apical structure present. Measurements. Body size 2.8–3.2 mm. Hind tibia 1.25–1.5 mm. Wing length 2.8–3.2 mm.
Diagnosis and discussion
The species is placed in the genus Gabyella for the reduced palpomeres and the lack of macrotrichia on the posterior wing veins. Additionally the awl-like setae on the inner side and on the apex of the gonostyli, characteristic for the genus Trichosiopsis, are finer, longer and more numerous. Therefore, the species was originally included in Corynoptera, but the undifferentiated patch of setae at the tip of the fore tibia indicate it as more closely related to Trichosiopsis.
The gonostyli in the holotype appear to be slightly dented apically, so that apical angle form a lobe-like structure bearing some setae. This setose lobe lies on the dorsal side of the gonostylus, whereas the apical spine is located ventrally and is only shifted downwards. This structure is not artificial, but appears in other species of the genus as well.
Etymology
opacus lat. = dark, shady.
Distribution
Russia[1].
Remark
In an earlier version of this Species-ID page a specimen from Canada was included, which has proven to belong to a different species.
Images
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References
- ↑ 1.0 1.1 Mohrig, W.; Krivosheina, N.; Mamaev, B. 1983: Beiträge zur Kenntnis der Trauermücken der Sowjetunion (Diptera, Sciaridae). Teil III. Neue Sciariden aus dem Gebiet Chabarowsk. Zoologische Jahrbücher, Abteilung für Systematik, Ökologie und Geographie der Tiere, 110(1), 1–10.
- ↑ 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.
