Vilcabamba thistletail
A phylogenetic study published in 2015 that examined both DNA sequence data and vocalization recordings of members of the genus "Asthenes" found that the Ayacucho thistletail was more similar to the eye-ringed thistletail than it was to the Vilcabamba thistletail . 
<triplet> eye-ringed thistletail <subj> Asthenes <obj> parent taxon <triplet> Vilcabamba thistletail <subj> Asthenes <obj> parent taxon