Order Rodentia - Suborder Hystricognathi Author Charles A. Woods text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 771 806 book chapter http://doi.org/10.5281/zenodo.7353083 1-56098-217-9 7353083 Tympanoctomys Yepes, 1941 . Rev. Inst. Bact., 9, 1940 [1941]:569 . TYPE SPECIES: Octomys barrerae Lawrence, 1941 . COMMENTS: Widely considered a synonym of Octomys (see Reig, 1986:408 ; Corbet and Hill, 1991:204 ), but Cabrera (1961:516), and Redford and Eisenberg (1992) considered it a separate genus based on very enlarged tympanic bullae.