Trichocoelina quintula, 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 : 41

Trichocoelina quintula sp. n.

Figs 14 A , 16 A

Material studied. Holotype male. FINLAND, Lkor (Lapponia kemensis orientalis) Salla , Värriö, Kuntasjoki (grid 7520406:3610772), Malaise trap, 29.VII –19.IX.2013, J. Salmela (in MZH).

Description. Male. Head. Face brown, antenna darker brown, maxillary palpus pale yellowish. Eye bridge 3 facets wide. Face with 20 fine setae. Clypeus with 2 setae. Maxillary palpus with 3 segments, lengths of segments poorly comparable in the specimen studied; 3 rd segment longer than 2 nd segment; 1 st segment with 1 seta, with a dorsal patch of sensilla; surface of antennal flagellomeres smooth, body of 4 th antennal flagellomere 2.1x as long as wide, the neck shorter than broad, the longest setae shorter than the width of flagellomere. Thorax. Brown, setae pale. Anterior pronotum with 7 setae. Proepisternum with 8 setae. Scutellum with 3 longer and some short and fine setae. Wing. Fumose. Length 2.0 mm. Width/length 0.40. Anal lobe moderate. Veins distinct. c/w 0.75. R 1 /R 0.90. stM and fork of M subequal in length. bM slightly longer than r-m, bM and r-m non-setose. Halter yellow. Legs. Yellow, coxal setae pale. Fore tibial organ forming a large distinct patch of pale setae in depression. Fore tibial spur longer than the tibial width. Abdomen. Pale brown, setae pale, moderately long. Hypopygium ( Fig. 14 A ). Brown, as abdomen. Intergonocoxal area long, with 2 small separate setose lobes. Gonocoxa narrow, longer than gonostylus, with short sparse setosity, medial margin basally smoothly curved. Gonostylus ( Fig. 16 A ) elongated, apically slightly narrowed, strongly impressed; with short setosity, a long and narrow apical tooth, and 5 medial megasetae; megasetae strong and slightly curved; with a long whiplash seta basad from the megasetae. Tegmen subtriangular, apically roundish, laterally straight, weakly sclerotized, with area of small aedeagal teeth. Aedeagal apodeme narrow and long.

BIN. Unknown.

Discussion. Trichocoelina quintula sp. n. resembles somewhat T. hiemalis (Mohrig & Mamaev) in having small intergonocoxal lobes and at most slightly curved, oblique gonostylar megasetae but differs in its much narrower gonostylus and in having only five, not more than ten, megasetae and in its narrower tegmen, see Figs 14 A , 16 A and fig. 4 in Mohrig et al. (1985). Trichocoelina quintula resembles also T. cochleata (Rübsaamen) but differs in having the gonostylus darker, not paler than gonocoxa, the gonostylus less strongly curved, the gonostylar megasetae shorter and stronger, smaller intergonocoxal lobes, and in lacking a semicircular rim on the tegmen.

Etymology. The name is derived from the Latin word quintus, fifth, referring to the five megasetae of the gonostylus.

Figures

FIGURE 14. Hypopygium, ventral. A. Trichocoelina quintula sp. n. (holotype). B. T. semisphaera 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.