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Superordinal and Intraordinal Affinities of Rodents: Developmental Evidence from the Dentition and Placentation

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Evolutionary Relationships among Rodents

Part of the book series: NATO Advanced Science Institutes (ASI) Series ((NSSA,volume 92))

Abstract

The origin and subsequent evolutionary radiation of the order Rodentia were based primarily on the development of a pair of enlarged, evergrowing incisors in both jaws, and concomitant specializations of the cheek teeth and associated musculoskeletal features of the jaws for gnawing and chewing. The earliest known fossil rodents from the Late Paleocene of North America (Wood, 1962), the Early Eocene of Europe (Michaux, 1968), and the Early Eocene of Asia (Shevyreva, 1976; Hartenberger, 1980) already exhibit elongated incisors, and the search for possible ancestors or sister-groups of rodents has focused on other eutherian groups that show some degree of incisor enlargement. These taxa have included the Lagomorpha and a number of early Tertiary groups: plesiadapiform Primates, Tillo-dontia, Mixodectidae, Microsyopidae, Apatemyidae, and, most recently, the Paleocene eurymyloids of Asia (see Li, 1977; Hartenberger, 1977, 1980; Li and Ting, this volume).

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Luckett, W.P. (1985). Superordinal and Intraordinal Affinities of Rodents: Developmental Evidence from the Dentition and Placentation. In: Luckett, W.P., Hartenberger, JL. (eds) Evolutionary Relationships among Rodents. NATO Advanced Science Institutes (ASI) Series, vol 92. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0539-0_9

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