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Investigation of the classification of the rodent genus Eumys from the Middle Oligocene of the Big Badlands of South Dakota /

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Abstract

Thesis (Ph. D.)--University of Wisconsin, 1973. Includes bibliographical references (leaves 249-254). Photocopy.

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... Discussion.-There is very little variation in the occlusal morphology of W. focarius compared to that of Eumys (Rosser 1978;Wahlert 2004;Korth et al. 2019). Wilsoneumys focarius is larger than all referred specimens of the type species, W. planidens (Table 11; Wilson 1949b: 49;Galbreath 1953: table 17;Setoguchi 1978: table 12). ...
... The dentition is lightly worn with only small areas of exposed dentine in the centers of cusps; connecting ridges are not broadened as they would be with deep wear. Dental variation in Eumys elegans and many other Oligocene muroids is known to be very high (Alker, 1967;Rosser, 1978;Dienemann, 1987;Wahlert, 2004); thus, the dental morphology of this one specimen cannot be taken as diagnostic for the taxon to which it belongs. Aside from differences in proportion, the upper and lower dentitions are nearly the mirror images of each other even in some small details. ...
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The skull and mandible, with complete dentitions, of an Orellan rodent are described as a new genus and species of Eumyinae (Rodentia, Muroidea, Cricetidae) based on a combination of unique and shared features: small molar series compared to skull size, featherlike diagonal ridges on surface of lower incisor enamel, rounded triangular shape of M3, and flat interorbital roof and separate temporal crests.
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Developed in preparation for reaffirmation of accreditation by the Commission on Colleges of the Southern Association of Colleges and Schools Curriculum vitae of Sue V. Rosser, Dean, Ivan Allen College.
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