Trichosiopsis imberba

Taxonavigation

Ordo: Diptera
Familia: Sciaridae
Genus: Trichosiopsis

Name

Trichosiopsis imberba (Rudzinski, 2005) – Wikispecies link – ZooBank link

• Leptosciarella imberba Rudzinski, 2005: 262-263, fig. 38-40

Type material

Holotype: ♂, in NCHU, 28.05-06.06.1997, Malaise trap, leg. Lin & Yang, TAI 46

Type locality

Taiwan, Nantou County, NE Puli, Road Nr. 14, Meifeng Experim. Farm, ca. 24°06'N / 121°10'E, 2100m

Papatypes

Taiwan: 2 ♂, same data as holotype TAI 47/48 (in ZSMC)

Description (male)

Head. Eye bridge 3–5 rows of facets. LW-index of 4^th antennal flagellar segment 1.4–1.8; neck 0.25–0.4 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 5–7 bristles; with only some sparse sensillae. Second palpomere shortly oval. Third palpomere as long as first segment. Thorax. Colour brown, or reddish. Notum unicolour. Thoracic setae normal; dark, or darkened. Mesonotum with some weaker central bristles. Posterior pronotum bare. Mesothoracic sclerites 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 weak, inconspicuous. 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 at or slightly before base of m-fork; posterior veins with macrotrichia; stM with a few macrotrichia, or bare; cuA₁ and cuA₂ mainly with macrotrichia; bM bare; r-m mostly setose; bM:r-M 0.7–0.95; st-Cu:bM 0.3–0.5; r₁:r 1.15–1.4; C:w 0.66–0.77. Halteres dark; of normal length. Abdomen. Abdominal setae strong and dense; dorsally dark; ventrally dark. Hypopygium concolour with abdomen; 0.55–0.75 × longer than wide. Base of gonocoxites with normal, weak hairs, or with strong setae; gonocoxites narrowly separated; inner margin of gonocoxites normally U-shaped; inner membrane of hypopygium scarcely setose; elongated setae on valves of hypopygium absent. Gonostylus elongate; 2.2–2.4 × longer than wide; Inner margin concave; apex equally rounded. Apical tooth present; 2.8–3.3 × longer than broad; normal. Awl-like setae normal; on inner side of gonostyles absent. Megasetae on inner part of gonostylus absent. Whiplash-hair absent. Tegmen 0.7–0.9 × longer than broad; equally rounded; normal; Central process absent. Length of aedeagus/hypopygium 25–35 %; Aeadeagal apical structure present. Measurements. Body size 3.3–3.9 mm. Hind tibia 1.1–1.35 mm. Wing length 3–3.5 mm.

Diagnosis

Trichosiopsis imberba is similar to Trichosiopsis scutellata and Trichosiopsis rejecta in having subrectangular gonostyli and some stronger bristles at the base of the gonostyles. However the apex of the gonostyles is more rounded in Trichosiopsis imberba, which makes it resemble the species around Trichosiopsis pilosa. The species is characterized by the peculiarly short antennal segments and the lacking awl-like setae below the apical tooth.

Discussion

Trichosiopsis imberba is a typical representative of the genus.

Etymology

lat. imberbis [imberba is an incorrect declination] = without beard, making reference to the bare prefrons.

Distribution

Taiwan.

Images

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