Key to Amazhomidia species

1 Cephalic groove with 1+1 surrounding scale-like chaetae (Fig. 10).............................................. 2

- Cephalic groove only with surrounding ciliate chaetae, scale-like chaetae absent (Figs 5D, 18E)....................... 3

2 Body dark blue; dorsal head with 4 mac on Gr. II (Fig. 18B); Th II with m2, m 2i and m4p mac (Fig. 6A); Brazil ...................................................................................... A. ducke Cipola & Bellini 2016

- Body dark yellow (Fig. 9); dorsal head with 5-6 mac on Gr. II (Fig. 13C); Th II without m2, m 2i and m4p mac (Fig. 14A); Brazil ................................................................................. A. thaisae sp. nov.

3 Antennal bulb absent (Fig. 3B); dorsal head with M1 and S1 mac respectively on median and sutural series (Fig. 5B); basomedian labial field with chaetae m1–2 (Fig. 5D); Abd II with 4 median mac (Fig. 6D); Abd IV with 29–30 median mac (Fig. 7A); Brazil ................................................................................ Amazhomidia sp. 1

- Antennal bulb present (Fig. 17B); head without M1 and S1 mac (Fig. 18B); basomedian labial field only with chaeta m1 (Fig. 18D); Abd II with 3 median mac (Fig. 19B); Abd IV with 17–19 median mac (Fig. 19C); Guyana ............................................................................................. A. guianiensis Womersley comb. nov.