Lygistorrhina (Lygistorrhina) Skuse, 1890

Blagoderov, Vladimir, Ollerton, Jeff & Whittington, Andrew, 2023, A new species of Lygistorrhina (Lygistorrhina) Skuse, 1890 (Diptera: Keroplatidae, Lygistorrhininae) with a key to the subgenus, Zootaxa 5361 (2), pp. 151-158 : 156

Key to the species of subgenus Lygistorrhina (Lygistorrhina) Skuse, 1890

1. Wing membrane hyaline................................................................................ 2

-. Wing membrane with spots or conspicuously darkened....................................................... 7

2. Base of CuA (position) conspicuously proximad of R 1 tip level................................................. 3

-. Base of CuA (position) at the R 1 tip level or distad of it....................................................... 5

3. R 5 bare.............................. Lygistorrhina indica Stebner & Grimaldi in Stebner et al., 2017 [India, Eocene]

-. R 5 setose............................................................................................ 4

4. Median ocellus smaller than lateral; antenna pale; basal flagellomeres as long as wide, hind femur and tibia darkened on apical third........................ Lygistorrhina edwardsina Grimaldi & Blagoderov, 2001 [Uganda, Kenya, Tanzania, Zaire]

-. Median ocellus equal to lateral; antenna dark; basal flagellomeres 2× as long as wide, hind femur and tibia entirely dark brown............................................................. Lygistorrhina magna Matile, 1990 [Zaire]

5. Sc free; R 5 bare; abdomen with pale basal spots or bands on segments 2–6.............................................................................................. Lygistorrhina nassreddinei Matile, 1979 [Grande Comore]

-. Sc ends on Costa; R 5 setose; abdomen unicolorous........................................................... 6

6. Median ocellus equal to lateral; Costa extends to 2/3 the distance between R 5 and M 1; hind femur entirely dark.................................................. Lygistorrhina austroafricana Blagoderov, Papp & Hippa, 2013 [South Africa]

-. Median ocellus smaller than lateral; Costa extends to half the distance between R 5 and M 1; hind femur darkened on apical third.................................................................. Lygistorrhina woodi , sp. nov. [Yemen]

7. Pigmented spot in cubital cell absent...................................................................... 8

-. Pigmented spot in cubital cell present.................................................................... 11

8. Flagellum unicolorous................................................................................. 9

-. Flagellum with pale and dark bands...................................................................... 10

9. Cell r1 and apical 2/5 of the wing evenly infuscate; Sc ends on Costa; abdomen unicolorous................................................................................... Lygostorrhina carayoni Matile, 1986 [New Caledonia]

-. Wing membrane with two greyish spots in the middle and at the tip of the wing; Sc ends free; abdomen with pale basal bands on segments 3–6................................... Lygistorrhina insignis Skuse, 1890 [Australia: New South Wales]

10. Flagellum with flagellomeres 5–6 and 12 yellow (flagellomere 13 brown); abdomen with pale basal bands on segments 2–4; M 1 and M 3+4 curved back....................................... Lygistorrhina hamoni Matile, 1996 [Côte d’Ivoire]

-. Flagellum with flagellomeres 5–6 and 12–13 yellow; abdomen with pale basal bands on segments 2–6; M 1 and M 3+4 conspicuously sinusoid..................................... Lygistorrhina legrandi Matile, 1990 [Gabon, Central African Republic]

11. Tip of the wing solidly infuscate; abdomen unicolorous..................... Lygistorrhina fijiensis Evenhuis, 2008 [Fiji]

-. Infuscate tip of the wing with hyaline spots; abdomen with pale bands or spots................................... 12

12. Fore coxa yellow; M 1 evenly curved back; abdomen with pale basal bands on segments 2–5................................................................................... Lygistorrhina pictipennis Okada, 1937 [Japan: Honshu]

-. Fore coxa at least partly brown; M 1 and sometimes M 3+4 sinusoid; abdomen with pale basal band on segment 6.......... 13

13. Abdomen with pale basal band on segments 4–6, flagellomeres with two or more prominent dorsal setae................................................................................ Lygistorrhina pentafida Papp, 2005 [Thailand]

-. Abdomen with pale basal band on segments 2–6; flagellomeres without prominent dorsal setae...................... 14

14. Flagellomeres 5–8 and 11–13 black, remaining yellow; basal flagellomeres at least 1.5× as long as wide; fore basitarsus slightly longer than fore tibia.................................................. Lygistorrhina chaoi Papp, 2002 [Taiwan]

-. Flagellomeres 3–4 and 8–14 black, remaining yellow; flagellomeres, except apical one as long as wide; fore basitarsus almost twice as long as fore tibia.............................. Lygistorrhina cincticornis Edwards, 1926 [Malaysia: Sarawak]