Data from: Oldest known multituberculate stapes suggests an asymmetric bicrural pattern as ancestral for Multituberculata

Julia A. Schultz, Irina Ruf & Thomas Martin
Middle ear ossicles (malleus, incus, stapes) are known only for few multituberculate taxa, and three different stapedial morphotypes have been suggested: (1) slender, columelliform and microperforate, (2) robust and rod-like, and (3) bicrural. Reinvestigation of Upper Jurassic (Kimmeridgian) mammalian petrosals from the Guimarota coal mine in central Portugal (Western Europe) revealed an asymmetric bicrural stapes (ABS) in the paulchoffatiid Pseudobolodon oreas. The middle ear bones displaced inside the osseous vestibule were detected by a microCT...
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