Sybistroma Meigen

Grichanov, Igor Ya. & Kazerani, Farzaneh, 2014, A new species of Sybistroma Meigen (Diptera: Dolichopodidae) from the Middle East with a key to West-Palaearctic species of the genus, Zootaxa 3866 (4), pp. 572-582 : 573-574

Key to the West-Palaearctic species of Sybistroma Meigen (males)

1 At least femora entirely or almost entirely brown-black........................................................ 2

- Legs mainly yellow or reddish yellow.................................................................... 8

2 Antennal stylus very long, basodorsal, with apical flag....................................................... 3

- Antennal stylus simple................................................................................ 5

3 Antennal stylus with rounded apical flag, flag entirely black; fore and mid tibiae red-yellow, basal part of hind tibia reddish; body length 3.75 mm ( Stackelberg 1941, figs 154, VIII–77, IX–86).............................. spectabilis (Parent)

- Antennal stylus with lanceolate apical flag, flag black with white apex; legs entirely or almost entirely brown-black...... 4

4 Antennal stylus with apical expansion of 1st article in addition to apical flattening of 2nd article; body length 3.5 mm (Stackel- berg 1941, figs 148, VI–65, VII–72)........................................................... maerens Loew

- Stylus with apical flattening only; apical flag of stylus rhomboid, black, white at extreme apex; body length 3.5 mm (Stackel- berg 1941, figs VIII–78, IX–87).................................................. transcaucasica (Stackelberg)

5 Antennal postpedicel not longer than high; stylus of uniform thickness throughout; apicoventral epandrial lobe narrow, much longer than cercus; body length 2.5–3.0 mm ( Parent 1938, figs 249, 250).............................. lorifera (Mik)

- Postpedicel at least 1.5 times longer than high at base; stylus normal, tapering; apicoventral epandrial lobe various....... 6

6 Stylus middorsal; postpedicel 1.5 times longer than high at base; apicocentral epandrial lobe expanded distad, with very long hooked setae; body length 3.0 mm ( Parent 1938, figs 193, 194)..................................... caudata (Loew)

- Stylus almost apical or subapical; postpedicel at least twice longer than high at base; epandrial lobe with short simple setae.... 7

7 Stylus shorter than postpedicel; apicoventral epandrial lobe band-like, much longer than cercus, longer than hypopygium; body length 3.0 mm ( Parent 1938, figs 237–239) inornata (Loew)

- Stylus longer than postpedicel ( Figs 3 , 4 ); apicoventral epandrial lobe much shorter than cercus and hypopygium ( Fig. 5 ); body length 3.3–3.5 mm occidasiatica sp. nov.

8 Lower postocular setae white........................................................................... 9

- Postocular setae entirely black......................................................................... 19

9 Antennal stylus very long, with apical flag............................................................... 10

- Antennal stylus simple............................................................................... 14

10 Face densely covered with light hairs increasing in length downwards; postpedicel 11 times longer than high at base, with rounded expansion at 1/ 3 in addition to ovoid apical flag; body length 3.5 mm ( Grichanov 2000, figs 1–3)................................................................................................. israelensis (Grichanov)

- Face glabrous; postpedicel much shorter................................................................. 11

11 Postpedicel twice longer than high at base................................................................ 12

- Postpedicel not longer than high....................................................................... 13

12 Fore tarsus modified, basitarsus with narrow apical projection bearing 4 long cilia, tarsomere 2 with a short anterior and a long posterior seta at apex, 3rd tarsomere as long as 1st and 2nd combined; mid femur with long fine ventral setae; antennal stylus with strong, almost round, black flattening at apex; body length 5.0 mm ( Parent 1938, figs 336–340; Stackelberg 1941, figs 152a, 153, VIII-76, IX-84)........................................................................ eucera (Loew)

- Fore tarsus simple; mid femur without long setae; antennal stylus with long and rather narrow apical widening that is black in basal half and white in apical half; body length 3.0 mm ( Parent 1938, figs 341–344; Stackelberg 1941, fig. IX–85)................................................................................................ impar (Rondani)

13 Antennal stylus with spatulate apical flag with white narrow apical half; mid and hind femora with yellow basoventral setae; body length 3.9 mm ( Naglis 2011, fig. 1)...................................................... schachti Naglis

- Antennal stylus with rounded black apical flag with short whitish pointed apex; mid and hind femora bare ventrally; body length 3.5 mm ( Parent 1938, figs 332–335; Stackelberg 1941, figs 152b, VII–75).................... dufouri Macquart

14 Fore tarsus simple; hypopygium mostly yellow; antennal postpedicel 1.33 as long as high; stylus much longer than pedicel, located before middle of dorsal surface.................................................................. 15

- Fore tarsus modified; other features variable.............................................................. 16

15 Abdomen thin; segment 7 long and thin; hypopygium reaching posterior margin of abdominal segment 2; body length 3.5–4.0 mm ( Parent 1938, figs 307–310; Stackelberg 1941, figs 158, 159, VIII–79, IX–91).................. obscurella (Fallén)

- Abdomen thick; segment 7 short and thick; hypopygium reaching middle of abdominal segment 4; body length 3.0 mm ( Parent 1938, fig. 311; Stackelberg 1941, fig. IX–92) sciophila (Loew)

16 Antennal postpedicel not longer than high; stylus of uniform thickness throughout, with apical article 5 to 6 times as long as basal; foreleg with basitarsus bearing row of long ventral setae, tarsomere 5 white, enlarged and laterally compressed; body length 3.75–4.75 mm ( Parent 1938, figs 298–301; Stackelberg 1941, figs 155, 156, IX–88, IX–89)........ crinipes Staeger

- Postpedicel at least 1.5 times longer than high; stylus normal, tapering, with apical segment at most 2.5–3 times as long as basal one; foreleg not as above........................................................................ 17

17 Foreleg with tarsomere 5 flattened and black, greatly enlarged, tarsomere 4 short and slightly broadened; antennal stylus middorsal; body length 3.5–5.5 mm ( Parent 1938, figs 303–306; Stackelberg 1941, figs 157, IX–90) discipes (Germar)

- Foreleg with tarsomere 5 white........................................................................ 18

18 Tarsomere 4 and 5 of foreleg moderately enlarged; antennal stylus middorsal, with dot-like thickening at middle; body length 4.5–5.0 mm clara (Negrobov & Onishchenko)

- Tarsomere 5 of foreleg slightly enlarged; antennal stylus basodorsal; body length 4.0 mm ( Parent 1938, figs 312–314; Stackelberg 1941, fig. IX–93)................................................................. sphenoptera (Loew)

19 Legs simple....................................................................................... 20

- Fore or mid legs modified............................................................................ 21

20 Antennal stylus with black subapical flattening; postpedicel more than 4 times as long as high; cercus simple; body length 3.0 mm ( Stackelberg 1941, figs 151, VII–74)....................................................... setosa Schiner

- Antennal stylus simple; postpedicel 1.25 times as long as high; cercus bilobate; body length 2.5 mm ( Stackelberg 1949, figs 18, 29, 30)........................................................................ leptocerca (Stackelberg)

21 Fore leg and wing strongly modified; mid tarsus simple; antennal scape and pedicel entirely black................... 22

- Mid tarsus modified; fore leg and wing simple............................................................ 23

22 Fore femur and tibia strongly modified; wing margin strongly projecting between M1+2 and CuA1; cercus bilobate, with narrow lobes; body length 4.5 mm ( Stackelberg 1949, figs 19, 24, 28, 33)........................ paradoxoptera (Stackelberg)

- Fore femur and tibia simple; wing with deep emargination between M1+2 and CuA1; cercus simple, subrectangular; body length 3.9–4.4 mm ( Grichanov 2000, figs 4–6) sinaiensis (Grichanov)

23 Tarsomeres 3–5 of midleg widened and flattened laterally, black; antennal scape and pedicel yellow ventrally; body length 3.1 mm ( Grichanov 2000, figs 7–9)......................................................... golanica (Grichanov)

- Tarsomeres 3–5 of midleg somewhat widened, black, and tarsomere 5 snow-white............................... 24

24 Stylus expanded at middle only in addition to apical flattening; postpedicel nearly 3 times as long as high; antennal scape yellow ventrally; body length 3.0–4.0 mm ( Parent 1938, figs 326–330; Stackelberg 1941, figs 148, 149, VII–73).................................................................................................. nodicornis Meigen

- Antennal stylus with 2 expansions in addition to apical flattening............................................. 25

25 Postpedicel twice as long as high; antennal scape yellow ventrally; body length 3.5 mm ( Stackelberg 1941, figs 147, VI–64, VII–71)......................................................................... binodicornis Stackelberg

- Postpedicel 3 times as long as high; antennal scape and pedicel yellow ventrally; body length 5.1 mm ( Negrobov 1979, fig. 4).................................................................................. lenkoranica Negrobov

Figures

FIGURE 3. Antenna of Sybistroma occidasiatica sp. nov., male, phenotype A (Turkey)

FIGURE 4. Antenna of Sybistroma occidasiatica sp. nov., male, phenotype B (Israel).

FIGURE 5. Hypopygium of Sybistroma occidasiatica sp. nov., left lateral view (ventral setae of cercus not shown). Abbreviations: aepl—apicoventral epandrial lobe, bepl—basiventral epandrial lobe, cer—cercus, ep—epandrium, hyp—hypandrium, pgt—postgonite, ph—phallus, dsur, vsur—surstylus (dorsal and ventral lobes).