A newick tree representing the phylogeny of 228 mammal species used for comparative phylogenetic analyses of semicircular canal morphology. This phylogeny was estimated in BEAST 1.5.4 (Drummond & Rambaut, 2007) using Cytochrome B sequences downloaded from GenBank and 16 fossil constraints taken from literature sources, node ages are given in millions of years. Questions or inquiries should be directed to Kalina Davies (kalinadavies@gmail.com)