Hercostomus baishanzuensis
Creators: name: Tang, Chufei
name: Zhang, Lili
name: Yang, Ding
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Hercostomus
Hercostomus baishanzuensis

description: Key to species (males) of Hercostomus baishanzuensis group
(modified from Yang et al. 2011)
1 Acr present.......................................................................................... 2
– Acr absent.......................................................................................... 25
2 First flagellomere elongated, at least 2 times longer than wide................................................. 3
– First flagellomere not elongated, less than 2 times width..................................................... 9
3 Postocular bristles black............................................................................... 4
– Mid and lower postocular bristles pale yellow................................... H. caixiae Zhang, Yang et Grootaert
4 Basal segment of arista short, 0.3 times as long as apical portion of arista (Yang et al 2011, fig. 434)............................................................................................... H. curvilobatus Yang et Saigusa
– Basal segment long, 0.5–1.0 times as long as apical portion of arista............................................ 5
5 Arista arising at middle of the first flagellomere............................................................ 6
– Arista arising near the base of the first flagellomere......................................................... 7
6 Phallus specialized, hazelnut-shaped at tip (Fig. 21)......................................... H. nuciformis sp. nov.
– Phallus not strongly modified (Yang et al. 2011, fig. 431)............................ H. baishuihensis Yang et Saigusa
7 Fore tibia with 1 weak apical bristle......................................................... H. spatiosus Yang
– Fore tibia without apical bristle......................................................................... 8
8 Arista arising at basal third of first flagellomere; inner epandrial lobe small (Yang et al. 2011, fig. 440).............................................................................................. H. jingxingensis Yang et Saigusa
– Arista arising at basal fourth of first flagellomere; inner epandrial lobe long and finger-shaped (Yang et al. 2011, fig. 447).............................................................................. H. qinlingensis Yang et Saigusa
9 Coxae not all black................................................................................... 10
– Coxae all wholly black................................................................................ 13
10 Fore coxa brownish (Fig. 9)........................................................... H. pailongensis sp. nov.
– Fore coxa yellow................................................................................... 11
11 Mid and hind coxae black............................................................... H. fanjingensis Wei
– Mid coxa blackish to black except at base, hind coxa yellow................................................. 12
12 Antenna dark yellow, first flagellomere black except base; fore tibia with 1 short ventral apical bristle (longer than width of fore tibia); outer epandrial lobe long and narrow (Yang et al. 2011, fig. 443)............. H. longilobatus Yang et Saigusa
– Antenna black; fore tibia with 1 long apical ventral bristle (nearly as long as fore tarsomeres 1); outer epandrial lobe wide (Yang et al. 2011, fig. 441)...................................................... H. latilobatus Yang et Saigusa
13 Basal segment of arista short, shorter than 0.3 times length of apical portion of arista.............................. 14
– Basal segment of arista long, about 0.4–0.6 times length of apical portion of arista................................ 16
14 Fore tibia with apical bristle........................................................................... 15
– Fore tibia without apical bristle......................................................... H. xinjianganus Yang
15 Male cercus brown (Fig. 5).......................................................... H. galonglaensis sp. nov.
– Male cercus mainly brown, but yellowish at base (Fig. 4)....................................... H. flavus sp. nov.
16 Mid and lower postocular bristles light yellow............................................................ 17
– All postocular bristles black........................................................................... 18
17 First flagellomere 1.7 times longer than wide, arista arising from middle; cercus nearly square (Yang et al. 2011, fig. 432)........................................................................................... H. basalis Yang
– First flagellomere as long as wide, arista arising subapically; cercus nearly triangular (Yang et al. 2011, fig. 450).................................................................................... H. subtruncatus Yang et Saigusa
18 Male cercus with short to long digitations................................................................ 19
– Male cercus only with short digitations.................................................................. 20
19 First flagellomere blunt at tip; inner epandrial lobe short and thin (Yang et al. 2011, fig. 444). H. masunagai Yang et Saigusa
– First flagellomere sharp at tip; inner epandrial lobe long and strong (Yang et al. 2011, fig. 435)................................................................................................... H. curviphallus Yang et Saigusa
20 Inner epandrial lobe long, nearly as long as outer epandrial lobe (Yang et al. 2011, fig. 453).......... H. xizangensis Yang
– Inner epandrial lobe not obvious or very short............................................................ 21
21 Fore tibia with 1 long obvious ventral apical bristle........................................................ 22
– Fore tibia without obvious ventral apical bristle........................................................... 23
22 First flagellomere 1.8 times longer than wide, sharp at tip; femora blackish to black (Yang et al. 2011, fig. 439)............................................................................................... H. hunanensis Yang
– First flagellomere 1.4 times longer than wide, blunt at tip; femora dark yellow (Yang et al. 2011, fig. 438)............................................................................................ H. hubeiensis Yang et Saigusa
23 Inner epandrial lobe weak (Yang et al. 2011, fig. 445).................................. H. medialis Yang et Saigusa
– Inner epandrial lobe obvious.......................................................................... 24
24 Femora black, but tip yellowish brown.............................................. H. serratus Yang et Saigusa
– Femora yellow, somehow dark at dorsum..................................................... H. dentalis Yang
25 Fore tibia with apical bristles.......................................................................... 26
–......................................................................... Fore tibia without apical bristle 29
26 Fore tibia with 3 apical bristles (Fig. 1)...................................................... H. bisetus sp. nov.
– Fore tibia with 1 apical bristle......................................................................... 27
27 Hypandrium thick, with spinous digitations on base (Yang et al. 2011, fig. 429)........... H. apicispinus Yang et Saigusa
–........................................................... Hypandrium without spinous digitations on base 28
28 Legs mainly black; outer epandrial lobe short and thick; male cercus with short digitations (Yang et al. 2011, fig. 430)................................................................................. H. baishanzuensis Yang et Yang
– Legs mainly yellow; outer epandrial lobe long and narrow; male cercus with long digitations (Yang et al. 2011, fig. 442)............................................................................. H. longidigitatus Yang et Saigusa
29 Legs mainly black.................................................................................. 30
– Legs mainly yellow....................................................................... H. nudus Yang
30 Phallus with 1 large, sharp dorsal tooth (Fig. 14)........................................... H. deltodontus sp. nov.
– Phallus without tooth (Yang et al. 2011, fig. 451).................................. H. subtruncatus Yang et Saigusa
description: Published as part of Tang, Chufei, Zhang, Lili & Yang, Ding, 2014, New species of Hercostomus baishanzuensis group from Tibet (Diptera: Dolichopodidae, Dolichopodinae), pp. 549-562 in Zootaxa 3881 (6) on pages 550-551, DOI: 10.11646/zootaxa.3881.6.4, http://zenodo.org/record/226269