Polypedilum (Tripodura) Townes 1945
Creators: name: Chen, Jinxian
name: Zhang, Ruilei
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Polypedilum

description: Key to known male imagines of the subgenus Tripodura from China
1. Superior volsella normal Polypedilum type, slender and with an apical projection.................................. 2
- Superior volsella broad, pad-like and without apical projection; or elongate and calvate............................. 3
2. Superior volsella slender and S-shaped................................................... procerum Zhang et al.
- Superior volsella sickle-shaped.......................................................... falcatum Zhang et al.
3. Superior volsella elongate and calvate.................................................................... 4
- Superior volsella broad, pad-like and without apical projection................................................. 7
4. Superior volsella straight and finger-like, with 2 strong transverse setae and a group of slender setae on inner margin, with 1 long outer apical setae................................................................................. 5
- Superior volsella not as above........................................................................... 6
5. Lateral projection of anal point very long, strongly sclerotized and without macrotrichia; cell r 4+5 with 1 spot.................................................................................. nudiprostatum Zhang, Wang & Saether
- Lateral projection of anal point very short and covered with macrotrichia; cell r 4+5 with two spots...................................................................................................... bispinum Zhang & Wang
6. Superior volsella turned inwards apically with 2 long sub-apical setae and 1 apical seta directed medially; anal point with 2 smaller lobe on the side......................................................... mengmanense Zhang & Wang
- Superior volsella toe-like, with 3 apical setae; anal point lanceolate.......................... pollicium Zhang & Wang
7. Tergite IX without lateral projections or shoulders........................................................... 8
- Tergite IX with lateral projections or conspicuous shoulders.................................................. 16
8. Anal point elongation extremely reduced............................................ conghuaense Zhang & Wang
- Anal point elongation normal............................................................................ 9
9. Anal point slender and nearly parallel-sided............................................................... 10
- Anal point broad or apically expanded.................................................................... 11
10. AR 0.80, terminal scale of front tibia oval and apically rounded, superior volsella with 3–5 long apical setae................................................................................................. masudai (Tokunaga)
- AR 1.32–1.66, terminal scale of front tibia triangular and apically pointed, superior volsella with 2 long apical setae......................................................................................... udominutum Niitsuma
11. Wing without markings, anal lobe reduced.......................................... absensilobum Zhang & Wang
- Wing with markings, anal lobe normal................................................................... 12
12. Superior volsella spatulated and inferior volsella with less than 5 setae....................... spathum Zhang & Wang
- Superior volsella pad-like and inferior volsella with more than 5 setae.......................................... 13
13. Terminal scale of fore tibia pointed, distal margin of superior volsella with less than 5 setae, anal point broad, distal part of r 4+5 clear.............................................................................................. 14
- Terminal scale of fore tibia rounded, distal margin of superior volsella with more than 19 setae, anal point spatula-shaped apically, distal part of r 4+5 cloudy........................................................................ 15
14. Cell m 1+2 with 2 distinct markings, superior volsella sub-quadrate with a beak-like inner process, inferior volsella with 9–12 oral setae, AR 1.18–1.38................................................................. japonicum (Tokunaga)
- Cell m 1+2 with 1 marking, superior volsella sausage-shaped without inner process, inferior volsella with 5–7 oral setae, AR 0.53–0.54............................................................................. anningense sp. n.
15. Anal point with 6 setae at base, superior volsella goblet-shaped; gonostylus slender and apex narrowed... cypellum Qi et al.
- Anal point with 2 rows of short setae on dorsal lamella, each row with 8−10 setae; superior volsella pediform; gonostylus moderately broad, apex not narrowed............................................... harteni Andersen & Mendes
16. Anal point slender and almost parallel-sided................................................ unifascia (Tokunaga)
- Anal point broad or apically expanded.................................................................... 17
17. Lateral of anal point very long, superior volsella rectangular................................ enshiense Song & Wang
- Lateral of anal point short, superior volsella not rectangular.................................................. 18
18. Superior volsella trapezium-shaped.................................................. trapezium Zhang & Wang
- Superior volsella not trapezium-shaped.................................................................. 19
19. Anal point with a pair of small lobes to each side........................................................... 20
- Anal point without a pair of small lobes to each side........................................................ 23
20. Superior volsella broad, inferior volsella with more than 10 oral setae.......................................... 21
- Superior volsella much slender, inferior volsella with less than 10 oral setae..................................... 22
21. AR 1.80–1.95, superior volsella with 1 long outer apical seta........................... decematoguttatum (Tokunaga)
- AR 0.61, superior volsella with 2 long outer apical setae................................ napahaiense Zhang & Wang
22. Cell r 4+5 with 1 spot, Cell m 1+2 with one spot confined to middle part, superior volsella not apically bended inwards...................................................................................... jianfengense Song & Wang
- Cell r 4+5 with 2 spots, Cell m 1+2 with one spot stretching from middle part to apical margin, superior volsella apically bended inwards............................................................................... biloborum sp. n.
23. Wing with 1 spot in cell r 4+5............................................................................ 24
- Wing with 2 spots in cell r 4+5 ........................................................................... 26
24. Fore tibial scale rounded apically........................................................ scalaenum (Schrank)
- Fore tibial scale pointed apically........................................................................ 25
25. Gonostylus slender and parallel-sided basal 1/4, lateral projection of anal point slender, marking in cell m 1+2 long and opposite to marking in cell r 4+5 ............................................................. parallelum Zhang & Wang
- Gonostylus not as above, lateral projection of anal point broad, marking in cell m 1+2 long and distal to marking in cell r 4+5.................................................................................... quadriguttatum Kieffer
26. Setae on vein R 4+5 less than 7 and situated distal 1/3 to apex........................... apiculusetosum Zhang & Wang
- Setae on vein R 4+5 more than 15 and situated from basal 1/4 to apex............................................ 27
27. AR more than 1.10, the superior volsella with 6–7 apical setae............................ cochlearum Zhang & Wang
- AR less than 0.80, the superior volsella with 1–3 apical setae.................................................. 28
28. The gonostylus expanded in the middle and bent like a bow............................... arcuatum Zhang & Wang
- The gonostylus not expanded in the middle............................................................... 29
29. The spots in cell m 1+2 dark and cloudy on wing distal margin............................... bilamella Zhang & Wang
- The spots in cell m 1+2 faint and clear on wing distal margin.................................. dengae Zhang & Wang
description: Published as part of Chen, Jinxian & Zhang, Ruilei, 2021, Two new species of subgenus Tripodura Towns (Diptera, Chironomidae, Polypedilum) from Oriental China, pp. 191-199 in Zootaxa 5072 (2) on pages 196-197, DOI: 10.11646/zootaxa.5072.2.8, http://zenodo.org/record/5733786