Gymnochiromyia, Hendel, 1933

Ebejer, M. J., 2008, New species of Gymnochiromyia Hendel, 1933 (Diptera: Schizophora: Chyromyidae) from Southern Africa, African Invertebrates 49 (1), pp. 77-77 : 83-86

Key to species of African Gymnochiromyia

1 Metanotum black or brown contrasting with pale adjacent sclerites; hypl darkened .............................................................................................................................. 2

– Metanotum yellow, if darker, not clearly contrasting with adjacent sclerites; hypl pale, only at base of haltere sometimes darker ..................................................... 5

2 Mesonotum with brown or black stripes .............................................................. 3

– Mesonotum not striped ......................................................................................... 4

3 Most of lateral margin of scut dark; ep dark; ♂ with brown mark in anterior half of apical third of wing; ♀with brown spot laterally at the middle of the third antennal segment; setae on head and thorax very long: anterior orb as long as width of fr at same level, posterior orb longer than height of eye, prescutellars as long as scut; ♂ postabdomen, Fig. 19 ............................................................... nubilipennis sp. n.

– Only basal part of lateral margin of scut dark; ep often yellow (variable); wing entirely hyaline; ♀with third antennal segment entirely yellow; setae on head and thorax of normal length: anterior orb about half as long as width of frons at same level, posterior orb distinctly shorter than height of eye, prescutellars about 1/3 as long as scut; ♂ postabdomen, Fig. 5 , ♀, Fig. 7 ............................... capensis sp. n.

4 1+3 dc, tergites shiny, ep brown, acrs in six rows; ♂ postabdomen, Fig. 26 .......................................................................................................... turneri sp. n.

– 0+2 dc, tergites matt, ep yellow with brown midline spot just above cerci and narrow brown transverse band along anterodorsal edge near tg 6 ( Fig. 2d ), acrs in eight rows; ♂ postabdomen, Fig. 3 , ♀, Fig. 4 ........................................... balteata sp. n.

5 The following character states present simultaneously: msn with two stripes, acrs in four rows, ep yellow without spots, apical segments of ♀abdomen without spots; ♂ postabdomen, Fig. 17 , ♀, Fig. 18 ................................................... milleri sp. n.

– msn without stripes, acrs in 6–8 rows (except in some specimens of gilva and megacephala where rows may be reduced to 4–6) ............................................... 6

6 Males .................................................................................................................... 7

– Females (note: females of gilva , malagasica & stuckenbergi are unknown) ..... 16

7 oc triangle yellow, tergites yellow dorsally, brown on lateral margins, 0+3 dc; ep with small oval spot in middle (as in maraisi , see Fig. 12 ); ♂ postabdomen, Fig. 25 ................................................................................................ stuckenbergi sp. n.

– oc triangle black or at least ocelli ringed with black, tergites darker dorsally than laterally or entirely yellow, 0+2 dc ....................................................................... 8

8 Epandrium, viewed from behind, with a distinct midline brown spot ................. 9

– Epandrium uniformly yellow.............................................................................. 13

9 Epandrial spot large, more or less rhomboidal and almost reaches anterior border of ep ( Fig. 2a ), oc triangle yellow, ocelli ringed with black; ♂ postabdomen, Fig. 8 .............................................................................................................. gilva sp. n.

– Epandrial spot smaller, occupying less than 1/3 width or height of ep when viewed from behind ......................................................................................................... 10

10 Prescutellar acrs distinct but short, epandrial spot broader, more pentagonal in shape with large central part clearly shining and well separated from edge of ep above cerci ( Fig. 2e ); ♂ postabdomen, Fig. 9 ................................... maculiventris sp. n.

– Prescutellar acrs setae well-developed; epandrial spot narrow oval or rectangular, not or very little shining and lower edge touching the margin of ep above the cerci ( Figs 2a, c, d, e ) .................................................................................................. 11

11 acrs in 8–10 irregular rows at level of transverse suture, epandrial spot small, more or less triangular and touching posterior margin of ep above cerci; ♂ postabdomen, Fig. 23 .............................................................................................. setulosa sp. n.

– acrs in 6–8 irregular rows at level of transverse suture, epandrial spot either rectangular or well separated from edge of ep above cerci ( Figs 2b, f ) ............. 12

12 Epandrial spot small, oval and situated at middle third ( Fig. 2b ), apex of distiphallus large and broadly globular; ♂ postabdomen, Fig. 12 ...................... maraisi sp. n.

– Epandrial spot narrow, rectangular and situated at posterior third just above cerci ( Fig. 2f ), apex of distiphallus narrow and more or less pointed; ♂ postabdomen, Fig. 21 .......................................................................................... punctata Ebejer

13 oc triangle dark, 0+1 dc, acrs in 6–8 rows, tergites long setulose; ♂ postabdomen, Fig. 20 ........................................................................................ pretoriella sp. n.

– Not with all these character states combined...................................................... 14

14 Head large and broader than thorax ( Fig. 15 ) with very deeply recessed gena, usually 0+3 dc, acrs posteriorly often markedly reduced in number to one or two pairs; ♂ postabdomen, Fig. 14 .............................................................. megacephala sp. n.

– Head normal, 0+2 dc, acrs posteriorly usually more numerous, at least 3–4 pairs ............................................................................................................................ 15

15 Frons broad, at level of antennae about 1.2 width of one eye; ♂ postabdomen, Fig. 11 ........................................................................................ malagasica sp. n.

– Frons narrower, at level of antenna about 0.8 width of one eye; ♂ postabdomen, Fig. 24 ............................................................................................ spinifera sp. n.

16 Apical tergites with well-defined dark spots ...................................................... 17

– Apical tergites without discrete dark spots ......................................................... 19

17 Tergites subshining, each becoming darker at middle third where more discrete brown spots appear, which in turn become darker towards apex of abdomen, sometimes a short brown stripe is present along dc line posteriorly, sometimes metanotum more brownish than yellow, abdominal setulae long pale brown to black: on dorsal aspect of tergites at least 2/3 length of tg; ♀postabdomen, Fig. 10 ....... ............................................................................................... maculiventris sp. n.

– Tergites matt, usually only tg 7 with small, brown, more or less quadrate spot at middle third; setulae on dorsal part of tergites short; most only 1/3 length of tg ............................................................................................................................ 18

18 Only tg 7 with small, brown, more or less quadrate spot at middle third; caudal end of plates of st 8 rounded and without any extension; ♀postabdomen, Fig. 13 ...... ......................................................................................................... maraisi sp. n.

– Either tg 7 with small, pale brown, more or less quadrate spot at middle third, or all tergites darkened at middle; caudal end of plates of st 8 with broad triangular extension; ♀postabdomen, Fig. 22 ............................................. punctata Ebejer

19 oc triangle dark, 0+1 dc, tergites with brown setulae ................. pretoriella sp. n.

– oc triangle yellow, 0+2 dc, tergites with brown or yellow setulae ..................... 20

20 Head large and broader than thorax, with deep and recessed gena; acrs sparse in 4– 6 rows, tergites yellow with pale setulae; ♀postabdomen, Fig. 16 ....................... ................................................................................................ megacephala sp. n.

– Head at most as broad as thorax and gena not recessed or exceptionally deep, acrs numerous in 6–8 rows ......................................................................................... 21

21 Tergites yellow with pale yellow setulae, which laterally are about 3/4 length of tg ......................................................................................................... setulosa sp. n.

– Tergites pale brownish yellow with dark brown setulae, which laterally are about only half length of tg ..................................................................... spinifera sp. n.

Figures

Figs 19, 20. Male hypopygia, lateral aspect: (19) G. nubilipennis sp. n., scale bar = 0.25 mm; (20) G. pretoriella sp. n., scale bar = 0.2 mm.

Figs 5, 6. G. capensis sp. n.: (5) male hypopygium, lateral view; (6) head, lateral view. Scale bars = 0.2 mm.

Fig. 7. G. capensis sp. n., female postabdomen, ventral (a) and lateral (b) views, and (c) spermatheca. Scale bar = 0.15 mm.

Figs 25, 26. Male hypopygia, lateral aspect: (25) G. stuckenbergi sp. n., (26) G. turneri sp. n. Scale bars = 0.3 mm.

Fig. 2. Gymnochiromyia, posterior aspect of ep, semidiagrammatic, with setae omitted and cerci in outline: (a) gilva sp. n., (b) maraisi sp. n., (c) setulosa sp. n., (d) balteata sp. n., (e) maculiventris sp. n., (f) punctata Ebejer.

Figs 3, 4. G. balteata sp. n.: (3) male hypopygium, lateral view, scale bar = 0.2 mm; (4) female postabdomen, ventral (a) and lateral (b) views, and (c) spermatheca, enlarged, scale bar = 0.15 mm.

Figs 17, 18. G. milleri sp. n.: (17) male hypopygium, lateral view, scale bar = 0.25 mm; (18) female: ventral views of subanal plate (a) and st 8 (b), lateral views of subanal plate (c) and st 8 (d), and spermathecae (e), scale bar = 0.1 mm.

Figs 11, 12. Male hypopygia, lateral aspect: (11) G. malagasica sp. n., (12) G. maraisi sp. n. Scale bars = 0.2 mm.

Figs 8, 9. Male hypopygia, lateral aspect: (8) G. gilva sp. n., (9) G. maculiventris sp. n. Scale bars = 0.2 mm.

Figs 23, 24. Male hypopygia, lateral view: (23) G. setulosa sp. n., scale bar = 0.2 mm; (24) G. spinifera sp. n., scale bar = 0.3 mm.

Figs 21, 22. G. punctata Ebejer: (21) male hypopygium, lateral view, scale bar = 0.25 mm; (22) female postabdomen, lateral view (a), st 8, ventral view (b), spermatheca (c), scale bar = 0.15 mm.

Figs 14, 15. G. megacephala sp. n.: (14) male hypopygium, lateral view; (15) head, lateral view. Scale bars = 0.2 mm.

Fig. 10. G. maculiventris sp. n., female postabdomen, lateral (a) and ventral (b) views, and (c) spermatheca, enlarged. Scale bar = 0.2 mm.

Fig. 13. G. maraisi sp. n., female postabdomen, ventral (a) and lateral (b) views, and (c) spermatheca, enlarged. Scale bar = 0.15 mm.

Fig. 16. G. megacephala sp. n., female postabdomen, ventral, with sap omitted (a) and lateral (b) views, and (c) spermatheca, enlarged. Scale bars = 0.2 mm.