Triassomyia shcherbakovi, Lukashevich, 2022

Lukashevich, E. D., 2022, The oldest occurrence of Chaoboridae (Insecta: Diptera), Russian Entomological Journal 31 (4), pp. 417-421 : 420

Triassomyia shcherbakovi , sp.n.

Figs 1–4 .

MATERIAL. Holotype PIN 5329 /12, positive impression of an isolated wing, Dzhailoucho (Madygen, northern area); Leilek District , Batken Region, SW Kyrgyzstan; Madygen Formation, Ladinian–Carnian.

DESCRIPTION. Wing length 2.1 mm, width 0.6 mm. R 1 straight, Rs connecting R 1 evenly, Rs stem subequal to R 2+3 stem, 1.3 times as long as R 2; Rsa absent, Rs forking symmetrically; fork R 2+3 1.3 times as long as its stem, forming acute angle, about 45°, R 2+3 fork thrice as long as wide, R 3 1.8 times as long as R 2, distance between apices of R 2 and R 3 thrice as long as between apices of R 1 and R 2 and apices of R 3 and R 4+5; r-m longer than basal part of R 4+5 and subequal to basal part of M 4, level to m-cu; M 1+2 forking well before R 2+3 forking; anal lobe somewhat reduced.

ETYMOLOGY. The species epithet honors Dmitry Shcherbakov, a collector of the holotype and a recognized expert on fossil insects.

Figures

Figs 1–3. Triassomyia shcherbakovi gen. et sp.n., Madygen, Triassic; holotype: 1 — photograph; 2 — SEM, uncoated, BSE; 3 — drawing. Arrows mark the anal fold. Scale bars, 500 µm. Рис. 1–3. Triassomyia shcherbakovi gen. et sp.n., Мадыген, триас, голотип: 1 — фотографиЯ; 2 — СЭМ, беЗ напылениЯ, BSE; 3 — рисунок. Стрелки маркируют анальную складку. Длина масШтабных линеек 500 µm.

Figs 4–6. Wings of Mesozoic Chaoboridae (SEM, uncoated): 4 —Triassomyia shcherbakovi gen. et sp.n. (BSE), Madygen, Triassic; holotype; 5–6 — Rhaetomyia necopinata, Sogyuty, Jurassic, holotype; 4–5 — basiala (BSE); 6 — wing (LVSTD). Arrows mark the anal fold. Scale bars, 200 µm. Рис. 4–6. КрыльЯ меЗоЗойских Chaoboridae (СЭМ, беЗ напылениЯ): 4 — Triassomyia shcherbakovi gen. et sp.n. (BSE), Мадыген, триас, голотип; 5–6 — Rhaetomyia necopinata, Согюты, юра, голотип; 4–5 — баЗиала (BSE); 6 — крыло (LVSTD).Стрелки маркируют анальную складку. Длина масШтабных линеек 200 µm.