Limnia, Robineau-Desvoidy, 1830

Vikhrev, Nikita E., 2023, Notes on the Palaearctic fauna of Limnia (Diptera, Sciomyzidae), Amurian Zoological Journal XV (2), pp. 284-292 : 291-292

Key to Palaearctic Limnia and Trypetoptera ♂ ♀

1. Costal margin of wing (= cell R1) entirely darkened, without white areas (Figs. 12– 14). Katatergite much darker than adjacent pleura. (Prosternum always setulose. Anepisternum without strong seta(e), only with setulae).......................... 2

— Costal margin of wing (= cell R1) with alternating black and white rectangular sections, some black sections have a white spot inside (Figs. 12–14). Katatergite concolorous with adjacent pleura.......... 3

2. Mesonotum from scutellum to neck with a pair of distinct, wide, grey submedian vittae. Postpedicel longer, almost as long as pedicel. Costal margin of wing (= cell R1 ) more or less evenly darkened, usually unspotted (Figs. 12–13), rarely with indistinct spots. Anepisternal setulae minute. Palaearctic from Europe to East Siberia. Common in Europe , less common in W Siberia, rare in E Siberia. ♂: Median projection of hypandrium attached to its base ( Figs. 2–4 )..................... unguicornis Scopoli

— Mesonotum without distinct grey submedian vittae, i.e., submedian vittae light brown, almost concolourous with the rest surface of mesonotum. Postpedicel distinctly shorter than pedicel. Costal margin of wing (= cell R1 ) darkened not evenly, with 7-8 rounded darker spots (Fig. 14). Anepisternal setulae longer, especially so a row of 3–5 setulae on the posterior margin. Far Eastern islands: the Kurils and Japan. ♂: Median projection of hypandrium attached to its posterior projection ( Figs 5–8 ).......................... pacifica Elberg

3. Arista with sparse whitish hairs, stem of arista dark. Prosternum hairy. Anepisternum without strong seta, with setulae only. Mesonotum without grey vittae. ( Fig. 9 ).. ....................................... 4

— Arista with dense white hairs, stem of arista also white. Prosternum bare. Anepisternum with strong seta apart from fine setulae. Mesonotum with a pair of distinct, wide, grey submedian vittae........................... testacea Sack

4. Prosternum with only one pair of setulae. Abdomen with very wide and distinct lateral vittae. Wing pattern contrasting ( Fig. 11 ). Mesonotum with several dark-brown spots........ Trypetoptera punctulata Scopoli

— Prosternum widely setulose. Abdomen with narrow and less distinct lateral vittae. Wing pattern much less contrasting ( Fig. 10 ). Mesonotum without distinct dark spots.................. jakovlevi Elberg

Figures

Figs. 2–8. Hypandrium of Limnia: 2–4, L. unguicornis: 2 — our photo; 3 — L. paludicola; 4 — L. unguicornis (3, 4 from Elberg 1965: figs. 16, 17); 5–8 — L. pacifica: 5 — our photo; 6 — (from Elberg 1965: fig. 18); 7 — (from Przhiboro 2016: fig. 13); 8 — (from Yano 1978: fig. 9)

Figs. 9–11. General view: 9 — female Limnia testacea; 10 — male Limnia jakovlevi; 11 — female Trypetoptera punctulata Рис. 9–11. Общий виΑ: 9 — самка Limnia testacea; 10 — самец Limnia jakovlevi; 11 — самка Trypetoptera punctulata