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African origin of caviomorph rodents is indicated by incisor enamel microstructure

Published online by Cambridge University Press:  08 February 2016

Thomas Martin
Thomas Martin*
Affiliation:
Institut für Paläontologie, Freie Universität Berlin, Malteserstrasse 74-100, D-12249 Berlin, Germany
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Abstract

The same three subtypes of derived multiserial Hunter-Schreger bands are found in the incisor enamel of African phiomorph rodents from the late Eocene-early Oligocene and the oldest South American Caviomorpha from the Deseadan (late Oligocene). The synapomorphies contained therein, especially arrangement and orientation of interprismatic matrix, make an African origin of the Caviomorpha very probable. A North American origin of the Caviomorpha is thus rejected, as only primitive pauciserial Hunter-Schreger bands have been observed in possible ischyromyoid caviomorph ancestors. A multiserial Schmelzmuster apparently never evolved in the North American rodent fauna.

Type
Research Article
Information
Paleobiology , Volume 20 , Issue 1 , Winter 1994 , pp. 5 - 13
Copyright
Copyright © The Paleontological Society 

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References

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