Corynoptera tenuichaeta Vilkamaa & Menzel 2017, sp. n.

Corynoptera tenuichaeta sp. n.

Fig. 10 A, B

Material studied. Holotype male. RUSSIA, Taimyr Peninsula, on the river Zakharova Rassokha, 72.70°N, 101.08°E, pan trap, 1–10.VII.2011, A. V. Barkalov (in ISEA). Paratypes. RUSSIA, Krasnoyarsk region, Taimyr Nature Reserve, Aru-Mas, 72.50°N, 101.94°E, pan trap, 9–20.VII.2010, A. V. Barkalov, 2 males (in MZH and SDEI); Yamalo-Nenets Autonomous Okrug, on the river Longotegan, 67.32°N, 66.72°E, Malaise trap, 2– 28.VII.2015, A. V. Barkalov, 1 male (in MZH).

Description. Male. Head. Brown, maxillary palpus very pale brown, antenna concolorous with face. Eye bridge 2–3 facets wide. Face with 22–30 scattered dark longer and shorter setae. Clypeus with 1(2) dark setae. Maxillary palpus with 3 segments; 1 st segment longer than 3rd segment, 2nd segment shortest; 1 st segment with 1– 4 sharp setae, with an indistinct dorsal patch of sensilla. Body of 4th antennal flagellomere 1.9–2.3x as long as wide, the neck shorter than the width of flagellomere, the longest setae as long as the width of flagellomere. Thorax. Unicolorous dark brown, setae pale. Anterior pronotum with 5–7 setae. Proepisternum with 9–11 setae. Wing. Fumose. Length 1.4–1.6 mm. Width/length 0.40–0.45. Anal lobe small. R1/R 0.70–0.95. c/w 0.40–0.50. bM longer than r-m. bM non-setose, r-m non-setose or with 1 seta. Halter pale brown. Legs. Pale brown. Fore tibial organ with dark and strong vestiture, forming a row. Fore tibial spur longer than the tibial width. Abdomen. Pale brown, setae pale, short and fine. Hypopygium (Fig. 10 A). Brown, as abdomen. Gonocoxa strong, longer than gonostylus. The ventral setosity of gonocoxa sparse, setae at the apical part of the medial margin slightly elongated. Gonostylus (Fig. 10 B) elongated, curved, the medial side slightly impressed; the setosity sparse, apicomedially with a few elongated setae; with a curved apical tooth, with 6–7 subapical megasetae, the megasetae hyalinous, subequal in size, shorter than apical tooth, straight. Tegmen slightly longer than broad, apically truncate, weakly sclerotized, without a dorsal finger-like process. Aedeagal apodeme rather short.

Discussion. Corynoptera tenuichaeta sp. n. belongs to Corynoptera s. str. sensu Hippa et al. (2010) and resembles Corynoptera perpusilla Winnertz, 1867 and similar species, but can be distinguished by its gonostylus being rather broad up to its subapical part, with a straight medial margin, evenly curved in the apicolateral part, in having a relatively shorter apical tooth, and by its short megasetae which are more numerous than in any other similar species. Furthermore, the setae of its gonocoxa and gonostylus are short and fine (Hippa et al. 2010). See also under Corynoptera hystricina sp. n.

Etymology. The name is derived from the Latin word tenuis, narrow, and the Latinized Greek word chaite, hair, referring to the fine setosity of the male hypopygium.