In accord with AOS-SACC (Chesser et al. 2022), each of the two monotypic groups is recognized as a species: the group Streamertail (Red-billed) Trochilus polytmus polytmus becomes Red-billed Streamertail Trochilus polytmus; and the group Streamertail (Black-billed) Trochilus polytmus scitulus becomes Black-billed Streamertail Trochilus scitulus. There is only an extremely narrow, and apparently stable, hybrid zone between these two taxa (Gill et al. 1973, Graves 2015); there are exceptionally steep clines in bill color and genetics (Judy 2018); and vocal and display differences between them have been reported (Schuchmann 1977, 1979). Revise the range of Red-billed Streamertail from "Jamaica (except range of scitulus)" to "Jamaica (except in the far east)".
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.