Trichocoelina semusta, Vilkamaa & Menzel, 2019

Vilkamaa, Pekka & Menzel, Frank, 2019, Re-classification of Lycoriella Frey sensu lato (Diptera, Sciaridae), with description of Trichocoelina gen. n. and twenty new species, Zootaxa 4665 (1), pp. 1-67 : 43-44

Trichocoelina semusta sp. n.

Figs 15 A , 16 C , 18 F

Material studied. Holotype male. ITALY, Trentino-Alto Adige, Bolzano, Parco nazionale dello Stelvio (NP Stilfser Joch), Suldental E of Gomagoi, 46°34’33’’N, 10°32’51’’E, 1220 m, mountainous area, spruce forest, Malaise trap, 18–21.V.2005, C. Lange & J. Ziegler (in ZMHB) . Paratypes. ITALY, same data as holotype, 1 male (in SDEI) ; USA, Alaska, Kingfisher Creek, Grande Denali Lodge , 63.743024°N, 145.883416°W, 14.VI.2016, J. Fitzgerald, 1 male (in MZH) .

Description. Male. Head. Face and antenna concolorous brown, maxillary palpus pale yellowish. Eye bridge 3 facets wide. Face with 19 setae. Clypeus with 1 seta. Maxillary palpus with 3 segments, 3 rd segment longer than 1 st segment, 2 nd segment shortest; 1 st segment with 1 seta, with dorsal patch of sensilla; surface of antennal flagellomeres smooth, body of 4 th antennal flagellomere 2.9x as long as wide, the neck shorter than broad, the longest setae as long as the width of flagellomere. Thorax. Dark brown, setae pale. Anterior pronotum with 3–5 setae. Proepisternum with 6–9 setae. Scutellum with 4 longer and some short and fine setae. Wing. Fumose. Length 2.2–2.4 mm. Width/length 0.40. Anal lobe weak. Veins distinct. c/w 0.60. R 1 /R 0.65–0.80. stM shorter than fork of M. r-m as long as bM, both non-setose. Halter yellow. Legs. Yellow, coxal setae pale. Fore tibial organ forming a weakly demarcated patch. Fore tibial spur longer than the tibial width. Abdomen. Pale brown, setae pale, moderately long and fine. Hypopygium ( Fig. 15 A ). Brown, as abdomen. Intergonocoxal area long, with distinctly bifid setose lobe ( Fig. 18 F ). Gonocoxa moderately broad, longer than gonostylus, medial margin smoothly curved, with sparse setosity. Gonostylus ( Fig. 16 C ) long, narrow, strongly impressed; with dense setosity, a long apical tooth, and 5–6 megasetae at middle; megasetae long and slender; with 1 well-differentiated whiplash seta at ventromedial margin. Tegmen as long as broad, laterally and apically roundish, with a semicircular subapical sclerotized rim, otherwise weakly sclerotized, aedeagal teeth not detectable in the specimens studied. Aedeagal apodeme long.

BIN. Unknown.

Discussion. By its strikingly dark setosity on the gonostylar apex, Trichocoelina semusta sp. n. resembles T. cochleata (Rübsaamen) but differs in having the apex less strongly curved, intergonocoxal lobes longer and closer to each other, the sclerotized rim of the tegmen broader and not protruding, and scapus and pedicellus concolorous brown with the flagellomeres, not yellow as in T. cochleata .

Etymology. The name is Latin, semusta , half-burned, referring to the dark setosity of the apex of the gonostylus of the species.

Figures

FIGURE 15. Hypopygium, ventral. A. Trichocoelina semusta sp. n. (holotype). B. T. tecta sp. n. (holotype). Scale 0.1 mm.

FIGURE 16. Gonostylus, ventral. A. Trichocoelina quintula sp. n. (holotype). B. T. semisphaera sp. n. (holotype). C. T. semusta sp. n (holotype). D. T. tecta sp. n. (holotype). Scale 0.1 mm.

FIGURE 18. Intergonocoxal lobes of hypopygium, ventral. A. Trichocoelina aemula (holotype). B. T. dispansa sp. n. (paratype). C. T. ithyspina sp. n. (holotype). D. T. jukkai sp. n. (paratype). E. T. planilobata sp. n. (holotype). F. T. semusta sp. n. (holotype). Scale 0.05 mm.