It is often considered a subspecies of the Rufous Fieldwren, most notably by Christidis and Boles in their 2008 work, but as a separate species by many other authorities including the IOC.
Rufous-winged Illadopsis | Rufous-naped Lark | Rufous-collared Kingfisher | Rufous-vented Chachalaca | Rufous Minor | Rufous Hornero | Rufous Fantail | Rufous Bristlebird | Rufous-bellied Thrush | Western Fieldwren | Rufous-vented Paradise Flycatcher | Rufous Treepie | Rufous-throated Partridge | rufous minor | Rufous Fieldwren | Rufous-collared Sparrow | Chinese rufous horseshoe bat |
Western Fieldwren (Calamanthus montanellus) - sometimes considered a subspecies of the Rufous Fieldwren.