Heads up: Some or all of the identifications affected by
this split may have been replaced with identifications of Riparia. This
happens when we can't automatically assign an identification to one of the
output taxa.
Review identifications of Riparia paludicola 11945
Madagascar Martin Riparia cowani is split from Plain Martin R. paludicola (Clements 2007: 358)
Summary: The amazingly endemic-rich island of Madagascar now has yet another endemic, the Madagascar Martin, split from the widespread African Plain Martin.
Details: As with several of the taxa long treated as subspecies of Riparia paludicola (Mayr and Greenway 1960a), Riparia cowani was originally described as a full species, though by 1937 (Bannerman 1937) a version of the modern polytypic species of R. paludicola was recognized. del Hoyo and Collar (2016), on the basis of plumage distinctions and the “very different vocalizations” (Boesman 2016 [No. 412]) of R. cowani, considered cowani a separate species. Brown (2019), in an unpublished Ph.D. study using UCE data, found a relatively deep divergence between R. cowani and R. paludicola, deeper than other subspecies in the study. Thus, WGAC and Clements et al. (2023) agree with del Hoyo and Collar (2016) in treating R. cowani as specifically distinct.
Clements, J. F., P. C. Rasmussen, T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2023. The eBird/Clements checklist of Birds of the World: v2023. Downloaded from https://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.