Myrmotherula longipennis

Chesser, R. Terry, Isler, Morton L., Santana, Antonita, Latch, Emily K., Stryjewski, Katherine Faust, Reed, Jennifer, Naka, Luciano N., Fleischer, Robert C. & Aleixo, Alexandre, 2025, Comparative phylogeographic patterns in three pan-Amazonian antwren lineages (Aves: Passeriformes: Thamnophilidae: Myrmotherula and Isleria), Zootaxa 5722 (1), pp. 1-44 : 6

Long-winged Antwren M. longipennis

Analyses of the combined data for M. longipennis distinguished four main clades, separated from one another by at least 2.4% uncorrected sequence divergence ( Table 1; Fig. 4 ). These clades are partly concordant with current subspecies taxonomy: two clades correspond to paraensis and longipennis , whereas garbei and zimmeri form a single main clade, and ochrogyna and transitiva form a single composite clade ( Fig. 4 ). (Below we refer to the composite ochrogyna/transitiva clade as ochrogyna; this name has priority over transitiva.) The Amazon-Napo separates longipennis from all other main clades, the Tapajós-Teles Pires separates paraensis from ochrogyna and garbei / zimmeri, and the Madeira separates ochrogyna from garbei / zimmeri. Two clades contain geographically structured subclades: longipennis is divided into eastern and western groups that are 1.5% divergent and appear to be separated, at least in part, by the lower Branco and lower Negro; within the garbei /zimmeri main clade, garbei and zimmeri form groups 0.6% divergent and likely separated by the Marañón. The clade from the Madeira-Tapajós interfluvium, which consists of ochrogyna and transitiva, also forms two subclades 0.6% divergent, but these are not geographically structured and consequently do not correspond to current subspecies limits. One subclade consists of individuals from the ranges of both ochrogyna and transitiva, whereas the other consists solely of the other individuals of transitiva (some from the same localities as those in the first subclade). The clade corresponding to subspecies paraensis also shows within-clade structure, in this case consisting of three groups, but these are not geographically structured. Support for the four main clades and four subclades ( garbei , zimmeri, and longipennis- E and -W) was generally strong: posterior probabilities were all 1.00 and bootstrap values were 72–100%. Relationships among clades were likewise strongly supported except for the sister relationship between ochrogyna and garbei /zimmeri, which received a posterior probability of 0.74 and a bootstrap value of 64%. The deepest split within the tree, which separated longipennis from all other main clades, was 5.9% uncorrected divergence.

Figures

FIGURE 4. Maximum clade credibility tree for Myrmotherula longipennis from the BEAST (Bouckaert et al. 2014) analysis. Individuals are color-coded by main clades but also identified by subspecies and subclade. Note the intermixing of samples of ochrogyna and transitiva in Main Clade 2. Samples of transitiva are marked with an asterisk; this clade is identified as ochrogyna because this name has priority over transitiva. Numbers above branches indicate posterior probabilities and ML bootstrap support values at the corresponding nodes.Arrows at nodes and corresponding text indicate rivers that separate clades united by the nodes.