The placement of ash-throated gnateater in a linear sequence remains unsettled. The Clements taxonomy places it between chestnut-belted gnateater (Conopophaga aurita) and Ceara gnateater (C. cearae)Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2019. The eBird/Clements Checklist of Birds of the World: v2019. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ Retrieved August 15, 2019, while the International Ornithological Committee (IOC) places it between hooded gnateater (C. roberti) and Ceara gnateater, with chestnut-belted gnateater preceding hooded. It is monotypic.
