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Left bony labyrinths of Cynocephalus volans and Tupaia tana. Arrows: Cynocephalus, as well as extant primates, exhibits a straight superior canal, whereas Tupaia exhibits a curved superior canal. Specimens: AIM-ZU AS-1904 (Cynocephalus) and AIM-ZU 10591 (Tupaia). Scale bar: 1 mm.
