Apolinar's wren has two subspecies, the nominate Cistothorus apolinari apolinari and C. a. hernandezi. The latter was described in 2002 and has been suggested to be a separate species.Kroodsma, D. E. and D. Brewer (2020). Apolinar's Wren (Cistothorus apolinari), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.apowre1.01 retrieved June 2, 2021 Apolinar's wren, grass wren (C. platensis), and Mérida wren (C. meridae) form a superspecies.Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 23 May 2021. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved May 24, 2021
