Cranial remains of Eumys elegans from Chalky Buttes, southwestern North Dakota, were examined and a composite diagram of a skull created. Eumys elegans is fully myomorphous and has a derived carotid artery circulation that is also found in some Old and New World muroids. Expansion of the posterior end of the jugal bone to form an articular surface that is part of the glenoid fossa is unusual in muroid rodents. The lower dentition is highly variable in both transverse crests and the connections of cusps to crests. Continuous variation in dimensions and heterogeneous molar crown morphology within individual tooth rows of a large sample of lower dentitions from Chalky Buttes suggest that only one, highly variable species was present. Variation in the upper dentition appears to be less. The rare enclosure of internal basins in the upper teeth parallels that development in other groups of muroids.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 2004 • No. 36