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Phyletic gradualism in a European Plio-Pleistocene Mimomys lineage (Arvicolidae, Rodentia)

Published online by Cambridge University Press:  08 April 2016

Jean Chaline
Affiliation:
Centre de Géodynamique sédimentaire et Evolution Géobiologique, U.A. CNRS 157, Laboratoire de Préhistoire et Paléoécologie du Quaternaire de l'EPHE, Institut des Sciences de la Terre de l'Université de Dijon, 6 boulevard Gabriel, F 21100 Dijon, France
Bernard Laurin
Affiliation:
Centre de Géodynamique sédimentaire et Evolution Géobiologique, U.A. CNRS 157, Institut des Sciences de la Terre de l'Université de Dijon, 6 boulevard Gabriel, F 21100 Dijon, France

Abstract

The European Plio-Pleistocene Mimomys (Hintonia) occitanus-ostramosensis lineage of arvicolid rodents appears to present a genuine case of gradual evolution. Analysis of numerous dental samples recorded from 3 to 1.5 ma by several biometrical methods led to the following conclusions: samples from the whole geographical area order into a morphological continuum (chronomorphocline); the successive populations in the trend show important overlap of their variation; and the absence of stasis or any interruption in the trend, combined with its unidirectionality, suggests genuine phyletic gradualism. The chronomorphocline is characterized by an important increase in tooth hypsodonty, by the progressive and continuous development of lateral enamel tracks. Four phases of evolution can be recognized in the lineage, the rates of morphological changes being variable and related to climatic fluctuations (Reuverian, Pretiglian, Tiglian, Eburonian). Morphological changes are initiated by environmental fluctuations, although the polarity of climatic change is not a determining factor. Environmental changes act as stimulus and release drift processes. Phyletic gradualism occurring over such a wide area implies extensive gene flow, and suggests that only general, not local, environmental components act to produce the observed morphological changes.

Type
Articles
Copyright
Copyright © The Paleontological Society 

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