Coenagrion holdereri ( Förster, 1900 ), Forster, 1900

Yu, Xin & Bu, Wenjun, 2011, Chinese damselflies of the genus Coenagrion (Zygoptera: Coenagrionidae), Zootaxa 2808, pp. 31-40 : 36-37

publication ID	https://doi.org/ 10.5281/zenodo.203945
DOI	https://doi.org/10.5281/zenodo.6184291
persistent identifier	https://treatment.plazi.org/id/2945473E-F878-743A-FF12-F9CC6C0DCF05
treatment provided by	Plazi
scientific name	Coenagrion holdereri ( Förster, 1900 )
status

Treatment

Coenagrion holdereri ( Förster, 1900) View in CoL

Agrion holdereri Förster, 1900: 264 View in CoL –267, figs 1–4; Schmidt, 1963: 22 –24, figs 1–6. Coenagrion holdereri: Davies and Tobin, 1984: 59 View in CoL .

Material. 1 ɗ, China, Nanschan, 10-VI-1898 [photos of the holotype] ( UMMZ); 5 ɗ, 6 Ψ, Shalingzi, Hebei, China, 2-VII-2006, Xin Yu leg. ( NKUM).

Description. Male. Labium pale yellow; labrum, bases of mandibles, anteclypeus, genae and frons blue; base of anteclypeus and postclypeus black; top of head, including antennae, entirely black; postocular spots blue, pearshaped; occipital bar blue, almost connecting with postocular spots. Prothorax black, with blue lateral marks; synthorax black dorsally, with narrow blue antehumeral stripes. Sides of synthorax blue ( Fig. 34 View FIGURES 34 – 41. C ). Legs pale blue with extensor surfaces of femora black. Wings hyaline, pterostigma brown, braced, each covering one cell. Abdomen blue with black marks as follows: S1 with a longitudinal broad dorsal mark, S2 with a big spade-shaped dorsal mark and short lateral stripes on each side ( Fig. 35–36, 39 View FIGURES 34 – 41. C ), dorsally apical 0.30 of segments 3–5, 0.80 of segments 6–7, 0.30 of S9 black, S10 entirely black dorsally ( Fig. 35–36 View FIGURES 34 – 41. C ). Caudal appendages black, as figured in Figures 37– 38 View FIGURES 34 – 41. C . Paraproct as long as S10, a little longer than cercus. Genital ligula ( Figs. 19–20 View FIGURES 12 – 33 ) with shield-like head and apical lobes in the form of a pair of strong flagella.

Female. More robust than male, body color bluish green, much similar as male on body marks except longitudinal broad black dorsal mark although abdomen. Caudal appendages short, vulvar spine robust, extending to the end of abdomen as shown in Figure 41 View FIGURES 34 – 41. C .

Measurements (mm): abdomen + appendage 23.5; hind wing 18.5.

Remarks. According to Förster (1900), the holotype of C. holdereri is a unique individual he collected from Nanschan (located in Xinjiang, China) which survived an accident. Förster (1900) believed C. holdereri indicates that Nanschan is the eastern border of Central Asia fauna of Odonata . After carefully comparing our specimens with the holotype photos provided by Dr. Mark F. O'Brien and figures in Schmidt (1963), which include all diagnostic characters, we believe our Hebei specimens are the same species as C. holdereri . The holotype of Coenagrion holdereri , preserved in the University of Michigan, Museum of Zoology, Michigan, USA, is broken and the genital ligula is missing.

Distribution. This little-known Chinese endemic is only known from Xinjiang and Hebei. The habitat in Hebei is now endangered due to drought and pollution.