Key to species of the genus Yapacana (males)

1 Without a large interocular spine; abdominal scutum with four areas...................................... Y. tibialis

- With a large interocular spine, abdominal scutum with three areas............................................... 2

2 Tibia IV without proventral, retroventral and dorsal rows of tubercles..................................... Y. neblina

- Tibia IV with at least retroventral and dorsal rows of tubercles.................................................. 3

3 Interocular spine short (less than half of the length of area III paramedian spines); patella IV with dorsodistal tubercles shorter than patella length............................................................................ Y. ianomami

- Interocular spine large (about 75% of the length of area III paramedian spines); patella IV with dorsodistal tubercles similar or larger than patella length..................................................................... Y. tapirapeco