Chrysosoma Guerin-Meneville 1831
Creators: name: Tang, Chufei
name: Zhu, Yajun
name: Yang, Ding
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Chrysosoma

description: Key to species (males) of Chrysosoma in the Himalayan region
1 Arista-like stylus very long, as long as or longer than body (Chrysosoma proliciens group)............................ 2
– Arista-like stylus relatively short, distinctly shorter than body.................................................. 4
2 Postpedicel and arista-like stylus fused, broad and shiny at base and curved back over entire body; 3 strong acr present; costal vein without curled bristles; halter dark brown; cercus brownish, with digitiform dorsal projection nearly as long as large bilobed, clavate ventral arm (Yang et al. 2011, fig. 94) [China, India, Nepal] …... Chrysosoma crinicorne (Wiedemann, 1824)
– Postpedicel triangular with long, curved dorsoapical arista-like stylus as long as body; 5 strong acr present; costal vein with short black, somewhat flattened and curly bristles extending to R 1; halter yellow; cercus yellowish, with short dorsal digitiform projection and large, bilobed clavate ventral arm (Bickel 1994, fig. 60) [India].............................. 3 (Walker, 1856)
3 Cercus with short digitations and a large bifurcated ventral arm ….................. Chrysosoma proliciens (Walker, 1856)
– Cercus long digitiform, wide and at apex (Wang et al. 2014, fig. 4) …... Chrysosoma nyingchiense Wang, Zhu & Yang, 2014
4 Wing with dark brown maculation, continuous along anterior margin, with shallow excavations on posterior margin in both sexes (Becker 1992, fig. 82) (Chrysosoma vittatum group)..................................................... 5 – Wing hyaline, without maculation (Chrysosoma leucopogon group in the Himalayan region)........................... 7
5 Mid and hind coxae black; cercus deeply bifurcated with strong bristles apically.................................... 6
– Mid and hind coxae yellow; cercus simple and hairy (Becker 1922, fig. 83) [India] … Chrysosoma vittatum (Wiedemann, 1819)
6 Antenna dark yellow except scape blackish; 7 acr present; ventral branch of cercus rod-like, with only 1 pale apical bristle (Yang et al. 2011, fig. 117) [China]..................................................... Chrysosoma varitum Wei, 2006
–.. Antenna wholly yellow except postpedicel slightly blackish dorsally; 5 acr present; ventral branch of cercus band-like, bifurcated lightly at apex, with several apical bristles and 1 long, strong dorsal bristle at apical third [China, India, Nepal]................................................................................. Chrysosoma cupido (Walker, 1849)
7 Arista-like stylus distinctly longer than head and thorax together; legs mainly black; cercus obviously bifurcated (Yang et al. 2011, fig. 107) [China, India, Nepal]................................. … Chrysosoma leucopogon (Wiedemann, 1824)
– Arista-like stylus not or nearly as long as head and thorax together; legs mainly yellow; cercus various................ … 8
8 Mid tarsomere I without spine-like v; cercus with apical incision (Wang et al. 2014, fig. 2) ….......................................................................................... Chrysosoma furcatum Wang, Zhu & Yang, 2014
– Mid tarsomere I with row of 4–5 spine-like v; cercus without apical incision (Wang et al. 2014, fig. 6) [China] ….......................................................................... Chrysosoma spinosum Wang, Zhu & Yang, 2014
description: Published as part of Tang, Chufei, Zhu, Yajun & Yang, Ding, 2019, Sciapodinae from the Himalayan region with description of nine new species from Tibet (Diptera: Dolichopodidae), pp. 1-28 in Zootaxa 4577 (1) on pages 17-18, DOI: 10.11646/zootaxa.4577.1.1, http://zenodo.org/record/2628496