Date of this Version
Published in Transactions of the Nebraska Academy of Sciences, Volume 4 (1977) pp. 121-138
The presence or absence of rugose areas and convex bosses on the skull are characters useful in the identification of most genera and species of fossil rhinoceros. A rhinoceros skull, collected more than a decade ago from Pliocene sediments in Boyd County, Nebraska (University of Nebraska Collecting Locality Bd-6, the Joseph Jamber farm), is like Diceratherium armatum in these respects, but it differs in others. It resembles Diceratherium in the presence of very small, elongate, roughened areas on the nasals, but the occipital region of the skull is wide, as in Peraceras. In skull outline, the resemblance is to Diceratherium, but the teeth are like those of Peraceras.
Indeed, this skull for some years was tentatively considered to represent a new species of Peraceras, but it is now assigned to Diceratherium as the latest species of this genus in the Tertiary of the High Plains.