Limited genetic data suggest that Fiery-necked Nightjar is sister to Montane Nightjar Caprimulgus poliocephalus, not to Black-shouldered Nightjar Caprimulgus nigriscapularis (Han et al. 2010). Nonetheless, Black-shouldered Nightjar is lumped into Fiery-necked Nightjar due to complete overlap in vocalizations (Dowsett and Dowsett-Lemaire 1993) and morphometrics (Jackson 2013), and minimal plumage differences (Louette 1990).
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.
