Docosia koyentagi, Kurina, Olavi & Ševčík, Jan, 2012

Kurina, Olavi & Ševčík, Jan, 2012, Notes on Docosia Winnertz (Diptera: Mycetophilidae), with description of six new species from Central Asia and the first generic record from the Afrotropical region, Zootaxa 3570, pp. 25-40 : 36

Docosia koyentagi sp. nov.

Figure 7 .

Type material. Holotype. 3, TURKMENISTAN, Kugitang Mts., 50 km NE Carsanga, 1500 m a.s.l. sweeping, 28.iv.1989 (V. Blagoderov leg.) [ BMNH, glued to a triangular card point].

Description. Male. Body length 2.5 mm (n=1).

Head black with numerous pale setae. Three ocelli, with laterals separated from eye margins by a distance less than their own diameter. Clypeus blackish brown, with pale setae. Mouthparts dark yellow. Palpus yellowish, with two apical segments paler. Scape dark brown, pedicel brown with yellowish apical part, first flagellomere basally yellowish, rest of flagellomeres brown and with short pale setae. Flagellomeres basally and apically slightly constricted, median flagellomeres about 1.6 times as long as broad, apical flagellomere conical, 2.14 times as long as broad at base.

All parts of thorax black with yellowish white bristles and setae. Scutellum with numerous setae, including two pairs of marginal bristles, one of them considerably stronger and several weaker bristles along the margin. Antepronotum and proepisternum with bristles and setae. Upper part of antepronotum with two strong bristles, one of them crossing the neck. Laterotergite setose, other pleural parts bare. Halteres yellow.

Legs. Midlegs, except coxae and trochanters, missing. Fore- and hind coxae yellow with basal fifths infuscated. Femora yellow with forefemur brown from underneath of basal fourth. All trochanters brown. Fore- and hind tibia yellow, apically thickened. Hind tibia with three apical black spinules between spurs. First and second tarsal segments yellowish, successive tarsal segments seem more brownish because of dense setae. Hind tibia with 13 a, 15 d, 3 av. Ratio of femur to tibia for fore- and hind legs: 1.13; 0.82. Ratio of tibia to basitarsus for fore- and hind legs: 1.41; 1.81.

Wing hyaline, length 3.12 mm (n=1). Costa, radial veins and r-m brown, other veins paler and M-stem faint. Sc, R4, bM-Cu, M-stem, basal third of cu-stem and basal two third of A1 asetose; C, R1, R5 and r-m setose on both surfaces; M1, M2, apical two third of cu-stem, CuA1, CuA2 and apical third of A1 setose on dorsal surface. Costa reaches 0.26 from R5 to M1. Sc distinctly ends in R, at the level of origin of M-stem. Anterior fork begins at the level of R4. Posterior fork begins before anterior fork at level of middle of r-m. R1 2.34 times as long as r-m, which is 0.9 times as long as M-stem.

Abdomen brown with sternites lighter. Terminalia ( Fig. 7 ) light brown. Ventroapical margin of gonocoxite emarginated with a bare finger-like medial process. Gonostylus with basal setae bearing extension and with two subapical spines: more basal spine much smaller and with clearly delimited basal body. Tergite 9 widening apically, without basal incision; apical margin slightly convex. Cercus with 10 combs of retinacula.

Female. Unknown.

Biology. Unknown.

Etymology. The species is named after the type locality in Kugitang Nature Reserve. “Koyentag” is the Turkmen name for “Kugitang” and means “almost impassable mountains”.

Discussion. Among Central Asian species D. koyentagi forms a group with D. sogetensis and D. bartaki because of the setose laterotergite, but differs from both in having yellow coxae. The bare finger-like medial process on the ventroapical margin of the gonocoxite resembles that of D. sogetensis but the latter has an additional lateral spines bearing processes (see Kurina 2006: fig. 4b). Docosia koyentagi have the gonostylus with two subapical spines and cercus with 10 combs of retinacula while D. sogetensis lacks spines and has five combs.

Figures

FIGURE 7. Docosia koyentagi sp. nov., male terminalia. a, lateral view; b, posterior view; c, ventral view of gonostylus; d, dorsal view of tergite IX; e, dorsal view of cerci; f, ventral view of aedeagal complex; g, lateral view of aedeagal complex. Scale bar = 0.1 mm.