title: Cochlear labyrinth volume in euarchontoglirans: implications for the evolution of hearing in primates.
abstract: Using high resolution X-ray computed tomography data we examined the relationship between cochlear labyrinth volume and body mass in extant, non-primate euarchontoglirans, and in two fossils, to allow for comparison with the results of Kirk and Gosselin-Ildari (2009). Modern primates have significantly higher cochlear labyrinth volumes relative to body mass than other euarchontoglirans, which may be related to a downward shift in the highest and lowest audible frequencies over the course of primate evolution, and to the relative increase in brain size observed in Euprimates.
authors.affiliation: Department of Anthropology, University of Winnipeg, Winnipeg, Manitoba, Canada.
authors.forename: Stephanie D
authors.initials: SD
authors.lastname: Armstrong
authors.forename: Jonathan I
authors.initials: JI
authors.lastname: Bloch
authors.forename: Peter
authors.initials: P
authors.lastname: Houde
authors.forename: Mary T
authors.initials: MT
authors.lastname: Silcox
mesh_terms: D000818:Animals; D005075:Biological Evolution; D015992:Body Mass Index; D003051:Cochlea / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D006309:Hearing; D007900:Lemur / Q000033:anatomy & histology*; D009929:Organ Size; D010802:Phylogeny; D011323:Primates / Q000033:anatomy & histology*; D012377:Rodentia / Q000033:anatomy & histology*; D016675:Scandentia / Q000033:anatomy & histology*; D014057:Tomography, X-Ray Computed