Detail of the bulla in ventral view. A Thomasomys burneoi, sp. nov. (MECN 5662, holotype), B T. pardignasi (MECN 5852, holotype), and C T. aureus sensu stricto (MEPN 6144). Acronyms: ab = auditory bulla, bet = eustachian tube, cc = carotid canal, me = mastoid exposure, pt = petrosal, sts = stapedial process of bulla.

  Part of: Lee Jr. TE, Tinoco N, Brito J (2022) A new species of Andean mouse of the genus Thomasomys (Cricetidae, Sigmodontinae) from the eastern Andes of Ecuador. Vertebrate Zoology 72: 219-233.