Two subspecies recognized:
alleni Chapman 1912; type locality Salento [Quindío], 7000 feet [ca 2140 m], Colombia
Occurs on the west slope of the Central Andes of Colombia; see Detailed Description.
andaquiensis Hernández and Rodríguez 1979; type locality vicinity of the Cueva le los Guácharos, Parque Nacional Cueva de los Guácharos, Huila, Colombia
Occurs in the upper Magdalena Valley, Colombia, and on both slopes of the Andes of northern Ecuador.
Similar to nominate alleni, but browner; belly ochraceous (not white), although sometimes with scattered whitish feathers
Described by Chapman (1912) as Grallaria alleni. This species was named in honor of Arthur A. Allen, who collected the type specimen (and who later founded the Cornell Lab of Ornithology).
The relationships of Grallaria alleni to other members of the genus are unresolved. Recent phylogenetic analyses of Grallaria, based on DNA sequence data, are incomplete and do not include Moustached Antpitta (Krabbe et al. 1999, Rice 2005). Hernández and Rodríguez (1979) suggested that Grallaria alleni, Grallaria guatimalensis (Scaled Antpitta) and Grallaria varia (Variegated Antpitta) might be conspecific. These three differ vocally, in morphology, and in habitat and elevational distribution, and the distributions of two of these (alleni and guatimalensis) approach one another very closely; consequently, they are best regarded as different species (Krabbe and Coopmans 2000).