Heads up: Some or all of the identifications affected by
this split may have been replaced with identifications of Aramides. This
happens when we can't automatically assign an identification to one of the
output taxa.
Review identifications of Aramides cajaneus 144280
Gray-necked Wood-Rail (Aramides cajaneus) has been split - birds from Mexico to northern and western Costa Rica are now Russet-naped Wood-Rail (A. albiventris), while birds from the central Pacific slope of Costa Rica through South America are now Gray-cowled Wood-Rail (A. cajaneus). The two species differ in plumage - Russet-naped has a rusty-brown nape (hence the name), which Gray-cowled lacks - and they also appear to differ markedly in vocalizations. (Be careful updating records from Costa Rica - the precise limits of the ranges of the two species are incompletely known, and it's thus unclear whether they come into contact; pay careful attention to nape color [and vocalizations, if you have recordings].)
From Clements:
In accord with AOU-NACC (Chesser et al. 2016), Gray-necked Wood-Rail Aramides cajaneus is split into two species: Russet-naped Wood-Rail Aramides albiventris, and Gray-cowled Wood-Rail Aramides cajaneus. This action is based on Marcones and Silveira (2015), who documented significant vocal differences, and less obvious but still consistent plumage differences, between the two species; they also pointed out that these two species appear to be parapatric, replacing one another rather abruptly. Following Marcones and Silveira (2015) Russet-naped Wood-Rail is considered to be monotypic; subspecies mexicanus, vanrossemi, pacificus, and plumbeiceps all are considered to by junior synonyms of albiventris, and are deleted. Revise the range description of albiventris from “Yucatán Peninsula, Cozumel I., Belize and adj. n Guatemala” to “Mexico (north to southern Oaxaca and southern Tamaulipas) south on both slopes to Nicaragua and northeastern Costa Rica.” Again following Marcones and Silveira (2015), subspecies latens and morrisoni are considered to be junior synoynms of nominate cajaneus, and are deleted. Revise the range description of cajaneus from “Costa Rica to n Argentina, Uruguay, Brazil and the Guianas” to “Costa Rica south to northwestern Colombia (including islands off of Panama) and, east of the Andes, to the Guianas and northeastern Brazil south to northern Argentina and Uruguay.”
Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2016. The eBird/Clements checklist of birds of the world: v2016. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/ (Link)
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.
Here's a detail of the split-line according to
http://zookeys.pensoft.net/articles.php?id=5182