Trichocoelina planilobata, 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 : 40-41

Trichocoelina planilobata sp. n.

Figs 12 A , 13 C , 18 E

Material studied. Holotype male. FINLAND, Li (Lapponia inarensis), Utsjoki, Pummankijoki (grid 7759292:539670), sandy river bank, pitfall trap, 13.VI–13.VII.2016, J. Salmela (in MZH).

Description. Male. Head. Face and antenna pale brown, maxillary palpus pale yellowish. Eye bridge 3–4 facets wide. Face with 20 setae. Clypeus with 1 seta. Maxillary palpus with 3 segments, 1 st segment longer than 3 rd segment, 2 nd segment shortest; 1 st segment with 1 seta, with a large dorsal patch of sensilla; surface of antennal flagellomeres smooth, body of 4 th antennal flagellomere 2.3x as long as wide, the neck shorter than broad, the longest setae longer than the width of flagellomere. Thorax. Dark brown, setae pale. Anterior pronotum with 5 setae. Proepisternum with 12 setae. Scutellum with 4 longer and some short and fine setae. Wing. Fumose. Length 1.7 mm. Width/length 0.40. Anal lobe rather weak. Veins distinct. c/w 0.70. R 1 /R 0.50. stM shorter than fork of M. r-m longer than bM, both non-setose. Halter yellow. Legs. Yellow, coxal setae pale. Fore tibial organ forming a rather large patch in shallow depression. Fore tibial spur longer than the tibial width. Abdomen. Pale brown, setae pale and rather long. Hypopygium ( Fig. 12 A ). Brown, as abdomen. Intergonocoxal area moderately long, with very broad, apically divided setose lobe ( Fig. 18 E ). Gonocoxa moderately broad, longer than gonostylus, medial margin strongly curved, with sparse setosity, ventroapically with denser setosity. Gonostylus ( Fig. 13 C ) long, broadest medially, apically truncate; impressed; with normal setosity, a long apical tooth, and one dorsal, two subapical and two medial megasetae; megasetae longer than tooth, basally angulate; with one well-differentiated whiplash seta on ventromedial margin. Tegmen broader than long, strongly sclerotized, aedeagal teeth not detectable in the specimen studied. Aedeagal apodeme rather long and strong.

BIN. Unknown.

Discussion. Trichocoelina planilobata sp. n. can be distinguished from all other congeneric species by its very broad intergonocoxal lobe of hypopygium. For further discussion, see under T. dispansa sp. n.

Etymology. The name is derived from the Latin words plana, flat, and lobus, lobe, referring to the broad intergonocoxal lobe of the hypopygium.

Figures

FIGURE 12. Hypopygium, ventral. A. Trichocoelina planilobata sp. n. (holotype). B. T. oricillifera sp. n. (holotype). Scale 0.1 mm.

FIGURE 13. Gonostylus, ventral. A. Trichocoelina obesula sp. n. (holotype). B. T. nefrens sp. n. (holotype). C. T. planilobata sp. n. (holotype). D. T. oricillifera 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.