The cheek-dentition approximates more or less to the perissodactyle type.
Among the scanty mammals of the Lower Eocene formation we have the perissodactyle Ungulata represented by Coryphodon, Hyra-cotherium, and Pliolophus.
Among the scanty mammals of the Lower Eocene formation we have the perissodactyle Ungulata represented by Coryphodon, Hyracotherium, and Pliolophus.
At the same time the differentiation of artiodactyle and perissodactyle forms existed as long ago as in the period of the Eocene ungulata, and that in a marked degree, as has been before observed.
Subsequent discoveries, however, seemed to give it an equal claim to rank amongst the perissodactyle forms.
Euprotogonia has been considered to be an ancestor of the Perissodactyle branch, and Protogonodon or Protoselene of the Artiodactyla.
If the middle toes appear by their slight pre-eminence to approach the Perissodactyle form, the peculiar surface contour of the molar teeth, letting alone the absence of a third trochanter on the femur, will not permit this classification.
The paired horned Titanotheria offer another instance of the same apparent incompatibility between the Perissodactyle structure and the persistence of paired horns.
The number of dorso-lumbar vertebrae is less in the Artiodactyle than in the Perissodactyle Ungulates.
It may be that this genus represents more nearly than any other Perissodactyle or Artiodactyle the primitive stem from which both have diverged, though, of course, it is not old enough to be very near to the actual ancestor.
This animal is in many respects the most ancient of existing forms referable to the Perissodactyle order.
The femur is Perissodactyle rather than Artiodactyle in the presence of a third trochanter.
As in the Rhinoceros--and in this both contrast with the other existing Perissodactyle genus Equus--the temporal fossa is not separated from the orbit by bone.
Nor on the other hand can all Ungulates which show the Perissodactyle condition be safely included in the present group.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "perissodactyle" in a variety of sentences. We hope that you will now be able to make sentences using this word.
