Prionochilus is one of two genera flowerpecker that make up the family Dicaeidae. The genus differs from the other flowerpecker genus, Dicaeum in having ten long primary feathers in the wing and in the character of its calls. A study comparing the calls of the two genera suggested that Prionochilus is basal to Dicaeum. The genus contains six species, in contrast to the 38 species in the genus Dicaeum.