It is about 12 cm long and weighs around 15 grams. The upperparts are mainly dark grey, the underparts are paler grey. The flanks are buff with dark bars. Adult males of the Mouse-coloured Tapaculo are uniformly dark grey with no flank barring. The song contains a long series of notes uttered at a rate of two or three per second. This compares to five notes per second in the faster song of the Mouse-coloured Tapaculo. The Planalto Tapaculo has a distinctive, monosyllabic contact call and a loud alarm call. It is known from southern Brazil (Rio Grande do Sul and Santa Catarina) and north-east Argentina (Misiones Province). It inhabits forest and forest edge where it is often found near streams and in undergrowth such as bamboo thickets. It has been found at higher densities in secondary forest rather than undisturbed forest. Scytalopus pachecoi occupies three separate areas in southern Brazil and adjacent north-eastern Argentina. It occurs in forest and forest edge habitats. Although having a relatively small and disjunct distribution it is not facing any risk of extinction, since it tolerates – and is apparently more numerous in – second-growth and disturbed forests, habitats still common within the regions where it occurs.
Maurício, G, (2005). Taxonomy of the southern population in the Scytalopus speluncae group, with the description of a new species and remarks on the systematics and biogeography of the complex (Passeriformes: Rhinocryptidae). Ararajuba. 13(1): 7-28.