Microdontinae

Reemer, Menno & Bot, Sander, 2015, Six new species of Microdon Meigen from Madagascar (Diptera: Syrphidae), Zootaxa 4034 (1), pp. 127-147 : 128

Key to Madagascan genera of Microdontinae

A key to the genera of Microdontinae of the world can be found in Reemer & Ståhls (2013). In the Afrotropical region, the key below may be used to recognize the African genera.

1 Abdomen oval (may be short or elongate) ( Figs 7 , 12 , 30 )..................................................... 2

- Abdomen petiolate ( Fig. 1 ).............................................................................. 4

2 Vein R4+5 with posterior appendix extending into cell r4+5 ( Figs 8 , 18, 19 )....................................... 3

- Vein R4+5 without posterior appendix ( Fig. 2)............................................ Afromicrodon Thompson

3 Antennae shorter than distance between antennal fossa and anterior oral margin (as in Fig. 4). Male genitalia: hypandrium with basolateral bulges, phallus wide, apically furcate ( Fig. 3)....................................... Archimicrodon Hull

- Antennae longer than or as long as distance between antennal fossa and anterior oral maring ( Figs 8 , 21 ). Male genitalia: hypandrium without basolateral bulges, phallus more slender, apically or basally furcate (e.g. Figs 10 , 15 , 29 , 53 )..................................................................................... Microdon Meigen (see next key)

4 Occiput without crease ( Figs 21 , 57 , 52 ). Metapleura connected, forming postmetacoxal bridge........................ 5

- Occiput with deep dorsolateral crease (Fig. 4). Metapleura separate, not forming postmetacoxal bridge.................................................................................................. Spheginobaccha de Meijere

5 Mesonotum with transverse suture complete, uninterrupted medially. Tergites 3 and 4 separate, not fused. Male with long pilosity on basoflagellomere ( Fig. 20 in Reemer & Ståhls 2013b)............................... Ceratrichomyia Séguy

- Mesonotum with transverse suture incomplete, interrupted medially. Tergites 3 and 4 fused. Male without long pilosity on basoflagellomere................................................................... Paramixogaster Brunetti

Figures

FIGURE 1. Spheginobaccha ruginosa Dirickx. Abdomen of male holotype.

FIGURES 7 – 10. Microdon berobaka Reemer sp. n. Male holotype. 7. Habitus dorsal. 8. Habitus lateral. 9. Head frontal. 10. Genitalia lateral.

FIGURES 11 – 15. Microdon harinhalai Reemer sp. n. Male holotype. 11. Habitus lateral. 12. Abdomen dorsal. 13. Head frontal. 14. Thorax dorsal. 15. Genitalia lateral (drawn from paratype).

FIGURES 30 – 31. Microdon irwini Reemer sp. n. Female paratype. 30. Abdomen dorsal. 31. Head frontal.

FIGURES 18 – 23. Microdon ifanadiana Reemer sp. n. Male holotype. 18. Habitus dorsal. 19. Habitus lateral. 20. Head frontal. 21. Head lateral. 22. Tergites 3 – 4. 23. Genitalia lateral.

FIGURES 26 – 29. Microdon irwini Reemer sp. n. Male holotype. 26. Habitus dorsal. 27. Habitus lateral. 28. Head frontal. 29. Genitalia lateral.

FIGURES 49 – 53. Microdon (Megodon) planitarsus Keiser. Male holotype. 49. Habitus dorsal. 50. Habitus lateral. 51. Head frontal. 52. Head lateral. 53. Genitalia lateral.

FIGURES 56 – 61. Microdon (Megodon) stuckenbergi (Keiser). Male holotype. 56. Habitus dorsal. 57. Habitus lateral. 58. Head frontal. 59. Head lateral. 60. Thorax dorsal. 61. Genitalia lateral.