Thomas had obtained the holotype from Argentinean-Italian scientist Roberto Dabbene, who worked in Buenos Aires at the time.

"[3] The Patagonian bonneted bat was widely considered a subspecies of the dwarf bonneted bat (Eumops bonariensis) from approximately 1932[4] until the 1990s.

[5] Based on Gregorin et al.'s 2016 classification, the Patagonian bonneted bat is a member of the bonariensis species group of the genus Eumops.

Other members include the dwarf bonneted bat, E. delticus, and E.

[6] It is a small member of its genus, with a forearm length of 44 mm (1.7 in).