Blue-throated Piping-Guan is split into two species, based on differences in plumage and in the color and shape of the wattle, and because there is only limited documentation of hybridization between them (Vaurie 1967). Therefore the monotypic group Blue-throated Piping-Guan (Blue-throated) Pipile cumanensis cumanensis becomes Blue-throated Piping-Guan Pipile cumanensis; and the monotypic group Blue-throated Piping-Guan (White-throated) Pipile cumanensis grayi becomes White-throated Piping-Guan Pipile grayi.

Reference:

Vaurie, C. 1967. Systematic notes on the bird family Cracidae. No. 7. The genus Pipile. American Museum Novitates 2296.