Coenagrion
Creators: name: Yu, Xin
name: Bu, Wenjun
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Coenagrionidae
Coenagrion

description: Key to Chinese Coenagrion species
1 Strong basal teeth of cerci present (Figs. 1, 7, 10)............................................................ 2
- No basal teeth on cerci................................................................................. 5
2 Abdomen blue laterally; paraprocts bifurcate with the upper branches slim, as long as the lower ones, truncated apically (Fig. 11 ........................................................................................ C. lunulatum
- Abdomen black laterally; paraprocts not bifurcate............................................................ 3
3 Paraprocts longer than cerci; apical segment of genital ligula with a pair of flagella-like apical lobes and a pair of short spine- like lateral lobes (Figs. 12–13)................................................................. C. aculeatum
- Paraprocts subequal than cerci; apical segment of genital ligula with only one pair of apical lobes...................... 4
4 Blue occipital bar present; thorax black ventrally; apical lobes of genital ligula leaf-like (Figs. 21–22)............ C. hylas
- Occipital bar absent; thorax pale ventrally; apical lobes of genital ligula flagella-like (Figs. 29–30)....... C. tengchongensis
5 Stout apical teeth present on upper branch of bifurcate cerci (Figs. 4–5)........................................... 6
- No apical teeth on upper branch of bifurcate cerci............................................................ 9
6 Cerci less than 0.5 length of paraprocts....................................................................7
- Cerci longer than 0.5 to approximately as long as paraprocts...................................................8
7 Apical segment of genital ligula ovoid, poorly sclerotized, with one pair of short leaf-like apical lobes (Fig. 16).... C. glaciale
- Apical segment of genital ligula shield-like, strongly sclerotized, with one pair of flagella-like apical lobes (Figs. 17–18).............................................................................................. C. hastulatum
8 Postocular spots narrow, comma-like; apical segment of genital ligula shield-like with one pair of curled flagella-like apical lobes (Figs. 14–15).......................................................................... C. ecornutum
- Postocular spots almost circular; Head of genital ligula shield-like with one pair of linear flagella-like apical lobes (Figs. 25– 26)...................................................................................... C. lanceolatum
9 Apical lobes of genital ligula broad and long, longer than apical segment of genital ligula (Figs. 19–20)........ C. holdereri
- Apical lobes of genital ligula narrow and short (Figs. 23–24), shorter than apical segment of genital ligula..... C. johanssoni
description: Published as part of Yu, Xin & Bu, Wenjun, 2011, Chinese damselflies of the genus Coenagrion (Zygoptera: Coenagrionidae), pp. 31-40 in Zootaxa 2808 on page 32, DOI: 10.5281/zenodo.203945