Key to known Afrotropical males of Thienemanniella

1. Inferior volsella digitiform, bare, phallapodeme straight ........................................................... T. antennata Freeman

- Inferior volsella not digitiform, most often carrying thin glandular setae, phallapodeme curved ............................... 2

2. Gonocoxite with large concavity for gonostylus, tergite IX with numerous long setae ........................ T. cavata sp. n.

- Gonocoxite without such concavity for gonostylus, tergite IX without numerous long setae ..................................... 3

3. Inferior volsella small, triangular with apodeme, tergite I with patch of 4–6 setae on each side................................... ................................................................................................................................................ T. trivittata Goetghebuer

- Inferior volsella a swelling or lobe with numerous inner setae, without apodeme; tergite I with 1–2 setae on each side ................................................................................................................................................................................ 4

4. Antenna with 8 flagellomeres. Tergite II and III each with 1 seta (Lehmann 1979 figs 134, 136).... T. fuga Lehmann

- Antenna with 10–12 flagellomeres. Tergite II and III with 3 or more setae................................................................. 5

5. Antenna with 10 flagellomeres, superior volsella narrow, not triangular, anteriorly fused, caudally in contact with inferior volsella ................................................................................................................................ T. lineola Freeman

- Antenna with 12 flagellomeres, superior volsella broad, triangular, anteriorly not fused, caudally not in contact with inferior volsella. (Lehmann 1979, figs 145, 147) ................................................................................ T. safi Lehmann