《Appendix 1 Measurements (in mm) of hind limbs among ungulates with diff erent types of locomotion a

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《内蒙古二连盆地沙拉木伦地区中始新世全脊貘(Teleolophus)(奇蹄目:貘超科)头后骨骼研究（英文）》

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Based on a) Osborn，1929；b) Wood et al.，2011；c) Bai et al.，2017a；d) Reshetov，1979；e) Qiu and Wang，2007.

The ternary diagram of the femur，tibia，and Mt III lengths separates out cursorial perissodactyls from other compared locomotor groups（Fig.8；Appendix I）.The diagram shows that the cursorial generally scores higher on the length of the Mt III and lower on length of femur than graviportal，ambulatory and medioportal（Osborn，1929；Smith and Savage，1956）.However，their tibial lengths overlap to some extent.One subcursorial taxon，Phenacodus primaevus，is grouped with ambulatory and medioportal.Recently，Gould（2016）suggested cursorial specilizations are not key innovations of Eocene perissodactyls，which accounts for the decline of condylarths in the Early Eocene.Equus and most cursorial artiodactyls have relatively longer Mt III and shorter femurs than extinct cursorial perissodactyls.However，Eocene oromerycid Eotylopus reedi is grouped with latter group.Teleolophus（with estimated femur length 260 mm）is clearly grouped with extinct cursorial perissodactyls，scoring higher Mt III length and lower femoral length within the group（Fig.8）.The result also suggests Teleolophus with an increased cursoriality as its contemporary Lophialetes among extinct cursorial perissodactyls，which is consistent with morphological analyses.