Trichocoelina imitator, 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 : 28

Trichocoelina imitator sp. n.

Figs 5 B , 6 D , 18 A

Material studied. Holotype male. CANADA, Yukon, Ogilvie Mountains, North Fork Pass , 4100 ft, 20.VI.1962, R.E. Leech (in CNC).

Description. Male. Head. Face brown, maxillary palpus pale yellowish. Eye bridge 3 facets wide. Face with 21 fine setae. Clypeus with 2 setae. Maxillary palpus with 3 segments, 1 st segment as long as 3 rd segment, 2 nd segment shortest; 1 st segment with 3 setae, with a dorsal patch of sensilla; antennae missing in the specimen studied.

Thorax. Brown, setae pale. Anterior pronotum with 5 setae. Proepisternum with 19 setae. Scutellum with 4 longer and some short and fine setae. Wing. In poor condition in the specimen studied. Fumose. Length about 2.8. Veins distinct. R 1 /R 0.70. r-m much longer than bM, bM non-setose, r-m with 4 setae. Halter yellow. Legs. Yellow, coxal setae pale. Fore tibial organ forming a large patch in depression. Fore tibial spur slightly longer than the tibial width.

Abdomen. Pale brown, setae pale, fine and moderately long. Hypopygium ( Fig. 5 B ). Brown, as abdomen. Intergonocoxal area long, basally with strongly sclerotized medial stripe, with 2 short setose lobes ( Fig. 18 A ). Gonocoxa broad, as long as gonostylus, medial margin basally strongly curved, with short sparse setosity. Gonostylus ( Fig. 18 A ) long and broad, apically truncate, strongly impressed; with short and dense setosity, with a short dorsal apical tooth in subapical position, with 10–12 megasetae medially, megasetae long and slender; with one long and 2–3 shorter whiplash setae basad of the megasetae. Tegmen longer than broad, conical, with sharp apicolateral corners, basolaterally broadened, apically and laterally sclerotized; aedeagal teeth not detectable in the specimen studied. Aedeagal apodeme long.

BIN. Unknown.

Discussion. Trichocoelina imitator sp. n. is very similar to T. oricillifera sp. n. in the form of the large gonostylus with numerous perpendicular megasetae but differs from the latter in the form of the tegmen, which is basally broader and has a longer apical part, and in having shorter intergonocoxal lobes of hypopygium.

Etymology. The name is Latin, imitator , referring to the close resemblance of the species to Trichocoelina oricillifera sp. n.

Figures

FIGURE 5. Hypopygium, ventral. A. Trichocoelina hians sp. n. (holotype). B. T. imitator sp. n. (holotype). Scale 0.1 mm.

FIGURE 6. Gonostylus, ventral. A. Trichocoelina dispansa sp. n. (holotype). B. T. dividua sp. n. (holotype). C. T. hians (holotype). D. T. imitator (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.