Key to Seirinae genera

1 Th II with one anterior extra group (a5 group) of at least 8 mac, p5 chaeta always as mic (Figs 13, 15A, 20A, 47A); unguis outer side with a pair of large laterobasal teeth (Figs 12C, 28E, 37F); Brazil and Paleotropical region..................................................................................................... Lepidocyrtinus B̂rner, 1903

- Th II with one anterior extra group (a5 group) with 5 or less mac, p5 chaeta mostly as mac; unguis outer side with a pair of normal laterobasal teeth................................................................................ 2

2 Inner labral papillae pointed; leg I of males generally without modifications, if present then femur normal and with elongated spine-like mac displaced in one longitudinal row on the median half; Worldwide................... Seira Lubbock, 1870

- Inner labral papillae bifurcate distally; leg I of males with femur internally strongly enlarged and with one subdistal group of short pointed spines displaced on transverse rows; Brazil ....................... Tyrannoseira Bellini & Zeppelini, 2011