Subspecies
Forms superspecies with Coppery-bellied Puffleg (Eriocnemis cupreoventris). Doubtful species "Eriocnemis soederstroemi" is regarded by some authors as a subspecies or aberrant form of present species, or a hybrid of Black-breasted Puffleg (Eriocnemis nigrivestis) and Sapphire-vented Puffleg (Eriocnemis luciani).
No subspecies.
Similar Species
Among pufflegs, blue throat patch of male is distinctive within range. Female Glowing Puffleg (Eriocnemis vestita) has extensive cinnamon-buff on throat and breast.
References
See References.