Euorthocladius, Thienemann, 1935

Kong, Fanqing, A. Saether, Ole & Wang, Xinhua, 2012, A review of the subgenera Euorthocladius and Orthocladius s. str. from China (Diptera: Chironomidae), Zootaxa 3537, pp. 76-88 : 87

Key to adult males of subgenera Euorthocladius and Orthocladius s. str. in China

1. Scutellars biserial or multiserial.......................................................................... 2

–. Scutellars uniserial.................................................................................... 6

2. AR <0.5, anal point 35 µm long......................................................... O. (E.) angustus sp. n.

–. AR> 1.0, anal point longer than 50 µm.................................................................... 3

3. Superior volsella widely triangular, gonostylus curved........................................ O. (E.) flectus sp. n.

–. Superior volsella not widely triangular, gonostylus straight..................................................... 4

4. Anal lobe produced; virga well developed.................................................................. 5

–. Anal lobe not produced, almost right-angled; virga absent or vestigial..................... O. (E.) suspensus (Tokunaga)

5. Inferior volsella with dorsal part wide and squared, palpomere 3 longer than 4.................. O. (E.) kanii (Tokunaga)

–. Inferior volsella with dorsal part slender, palpomere 3 shorter than 4........................ O. (E.) thienemanni Kieffer

6. Vein Cu 1 nearly straight, gonostylus with concave inner margin.............................. O. (O.) makabensis Sasa

–. Vein Cu 1 curved, gonostylus without concave inner margin..................................................... 7

7. Inferior volsella with ventral part fully covered by dorsal part............................. O. (O.) manitobensis Saether

–. Inferior volsella with ventral part not fully covered by dorsal part.............................................. 8

8. Inferior volsella with dorsal part long and narrow............................................................ 9

–. Inferior volsella with dorsal part short and broad........................................................... 10

9. LR 1 about 0.59–0.68 and AR about 1.40–1.70........................................... O. (O.) rhyacobius Kieffer

–. LR 1 about 0.71–0.79 and AR about 2.00–2.35........................................... O. (O.) excavatus Brundin

10. AR 1.58–2.12, gonostylus with a median projection.............................. O. (O.) nitidoscutellatus Lundström

–. AR 2.5–3.0, gonostylus without median projection............................... O. (O.) glabripennis (Goetghebuer)