<p>Around one hundred years ago the concept of different locomotory types was developed. Graviportal animals show limb bones adapted to bear great weight, while cursorial animals show limb bones adapted for fast running. In cursorial animals distal limb bones are elongated and proximal bones are short, in graviportal animals proximal bones are long and distal bones are short. Mediportal animals are intermediate between graviportal and cursorial animals. Different ratios of the limb bone lengths can be used to distinguish the different groups. According to this concept rhinos are belonging to the mediportal type. A dataset of around 200 (mostly) ungulates was analysed via principal component analysis and linear discriminant analysis, and rhinos are clearly plotting within the mediportal group. With this dataset containing the lengths of front and hind limb bones intervals for bone ratios are given to place individuals in the three groups. In recent literature rhinos are sometimes put in the graviportal group. As an example, three rhino species from the Miocene Sandelzhausen (Germany) locality were investigated to identify their locomotory type. <i>Prosantorhinus germanicus</i> shows short and more stout limb bones, while <i>Lartetotherium sansaniense</i> has long and slender limbs. <i>Plesiaceratherium fahlbuschi</i> shows medium sized limb bones. All three taxa are clearly plotting within the mediportal group while <i>Prosantorhinus</i> is closer to the graviportal taxa and the other two closer to cursorial taxa.</p>

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Mediportal rhinos – an outdated concept?

  • Rico Schellhorn

摘要

Around one hundred years ago the concept of different locomotory types was developed. Graviportal animals show limb bones adapted to bear great weight, while cursorial animals show limb bones adapted for fast running. In cursorial animals distal limb bones are elongated and proximal bones are short, in graviportal animals proximal bones are long and distal bones are short. Mediportal animals are intermediate between graviportal and cursorial animals. Different ratios of the limb bone lengths can be used to distinguish the different groups. According to this concept rhinos are belonging to the mediportal type. A dataset of around 200 (mostly) ungulates was analysed via principal component analysis and linear discriminant analysis, and rhinos are clearly plotting within the mediportal group. With this dataset containing the lengths of front and hind limb bones intervals for bone ratios are given to place individuals in the three groups. In recent literature rhinos are sometimes put in the graviportal group. As an example, three rhino species from the Miocene Sandelzhausen (Germany) locality were investigated to identify their locomotory type. Prosantorhinus germanicus shows short and more stout limb bones, while Lartetotherium sansaniense has long and slender limbs. Plesiaceratherium fahlbuschi shows medium sized limb bones. All three taxa are clearly plotting within the mediportal group while Prosantorhinus is closer to the graviportal taxa and the other two closer to cursorial taxa.