A new species of the genus Idioneurula Strand, 1932 is described from high elevation habitats (páramos) of the Serranía de los Yariguíes, Santander Department, in the eastern Andes of Colombia. Aspects of the ecology, distribution and con- servation of the new species are presented. The taxonomy of this genus and closely related Tamania Pyrcz, 1995 are dis- cussed. Based on adult morphology and ... [Show full abstract] supported by preliminary molecular analysis, it is proposed that the name Tamania Pyrcz, 1995 be treated as a junior subjective synonym of Idioneurula Strand, 1932. We propose treating Idion- eurula as comprising four species: I. erebioides (C. Felder & R. Felder, 1867); I. donegani Huertas & Arias, n. sp.; I. ere- mita Viloria & Pyrcz, 2007; and I. jacquelinae (Pyrcz, 1995). I. erebioides f. moderata (Weymer, 1911) and I. erebioides f. intermedia (Apolinar, 1914) are not recognised as valid taxa.