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

  • W. Patrick Luckett
Conference paper
Part of the NATO Advanced Science Institutes (ASI) Series book series (NSSA, volume 92)


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).


Tooth Germ Fetal Membrane Enamel Organ Dental Lamina Bell Stage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer Science+Business Media New York 1985

Authors and Affiliations

  • W. Patrick Luckett
    • 1
  1. 1.Department of AnatomyUniversity of Puerto RicoSan JuanUSA

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