1. Department of Functional Morphology and Biomechanics, Zoological Institute, Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 1–9 , Kiel 24118, Germany
2. Department of Cariology, Endodontology and Periodontology, Universität Leipzig, Liebigstraße 12 , Leipzig 04103, Germany
3. Department of Electron Microscopy, Institute of Cell and Systems Biology of Animals, Universität Hamburg, Martin-Luther-King-Platz 3 , Hamburg 20146, Germany
4. Department of Mammalogy and Palaeoanthropology, Leibniz Institute for the Analysis of Biodiversity Change, Martin-Luther-King-Platz 3 , Hamburg 20146, Germany