Crested Guineafowl is split into three species, based on differences in the color and pattern of the bare facial and neck skin, reported differences in vocalizations (summarized in del Hoyo and Collar 2014), and because introgression appears to be limited (e.g., Zimmerman et al. 1996), although also poorly studied: a monotypic Eastern Crested Guineafowl Guttera pucherani; a polytypic Western Crested Guineafowl Guttera verreauxi, with subspecies sclateri and verreauxi; and a polytypic Southern Crested Guineafowl Guttera edouardi, with subspecies barbata and edouardi.
Within Western Crested Guineafowl, reposition nominate verreauxi to precede, rather than follow, subspecies sclateri.
References:
del Hoyo, J., and N.J. Collar. 2014. HBW and BirdLife International illustrated checklist of the birds of the world. Volume 1. Lynx Edicions, Barcelona.
Zimmerman, D.A., D.A. Turner, and D.J. Pearson. 1996. Birds of northern Kenya and northern Tanzania. Princeton University Press, Princeton, New Jersey.
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.
