Abstract
In the Oligocene and Miocene, eutypomyids are intermediate to large size rodents. The primitive Wasatchian to Duchesnean species are small. No cranial material is known for species earlier than the Chadronian. The skull is low with a markedly elongate rostrum which is manifest in elongated nasal and premaxillary bones and upper diastema (Fig. 12.1). The neurocranium is also elongated. The skull is fully sciuromorphous (not known in pre-Chadronian species). The infraorbital foramen is relatively low on the rostrum as in sciurids. There is a pronounced process ventral to the infraorbital foramen for the attachment of the masseter superficialis. The incisive foramina are short.
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© 1994 Springer Science+Business Media New York
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Korth, W.W. (1994). Eutypomyidae. In: The Tertiary Record of Rodents in North America. Topics in Geobiology, vol 12. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1444-6_12
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DOI: https://doi.org/10.1007/978-1-4899-1444-6_12
Publisher Name: Springer, Boston, MA
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