Trichocoelina dividua, 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 : 23-24

Trichocoelina dividua sp. n.

Figs 4 B , 6 B

Material studied. Holotype male. CANADA, Northwest Territories, Nahanni National Park, Reserve Nailicho ( Virginia Falls ), 61.606°N, 125.758°W, 578 m, 1.VIII.2014, Parks Canada (BOLD Sample ID BIOUG17502-A06, in CNC) . Paratypes. CANADA, same data as holotype, 1 male (BOLD Sample ID BIOUG17506-C03, in CBG) ; same data as previous but 4.VII.2014, 3 males (BOLD Sample IDs BIOUG17107-F02, BIOUG17109-F06 and BIOUG17129-B09, in CBG) ; same data but 12.VII.2014, 1 male (BOLD Sample ID BIOUG17213-C11, in CBG) ; same data but 25.VII.2014, 1 male (BOLD Sample ID BIOUG17423-E03, in CBG) .

Description. Male. Head. Face brown, maxillary palpus pale yellowish. Eye bridge 2–3 facets wide. Face with 10–20 setae. Clypeus with 1–2 setae. 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 2.0x 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 5–9 setae. Proepisternum with 5–10 setae. Scutellum with 3–4 longer and some short and fine setae. Wing. Fumose. Length 1.5–1.6 mm. Width/ length 0.35–0.40. Anal lobe weak. Veins distinct. c/w 0.65. R 1 /R 0.45–0.7. stM as long as fork of M. r-m as long as bM, bM non-setose, r-m non-setose or with 1 seta. Halter yellow. Legs. Yellow, coxal setae pale. Fore tibial organ forming a rather small patch in depression. Fore tibial spur longer than the tibial width. Abdomen. Pale brown, setae pale, long and fine. Hypopygium ( Fig. 4 B ). Brown, as abdomen. Intergonocoxal area moderately long, with long, apically bifid setose lobe. Gonocoxa moderately broad, longer than gonostylus, medial margin basally strongly curved, with sparse setosity. Gonostylus ( Fig. 6 B ) long, apically tumid, impressed; with normal setosity, a long apical tooth, and one megaseta on the dorsal side of apical tooth, one subapical and 3–4 megasetae more basally, megasetae long and slender; with one well-differentiated whiplash seta on ventromedial margin. Tegmen as long as broad, laterally roundish, apically straight, weakly sclerotized; aedeagal teeth not detectable in the specimens studied. Aedeagal apodeme long.

BIN. BOLD:AAL7893.

Discussion. Trichocoelina dividua sp. n. is especially similar to T. jukkai sp. n. For further discussion of these and similar species, see under Trichocoelina dispansa sp. n.

Etymology. The name is Latin, dividua , parted, referring to the apically distinctly divided intergonocoxal lobe of hypopygium.

Figures

FIGURE 4. Hypopygium, ventral. A. Trichocoelina dispansa sp. n. (holotype). B. T. dividua 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.