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1 April 2014 The Evolution of High Dental Complexity in the Horse Lineage
Alistair R. Evans, Christine M. Janis
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The horse lineage (family Equidae) represents one of the clearest acquisitions of complicated derived dental morphology from a more generalized ancestor. Here we investigate the change in dental complexity (orientation patch count rotated, OPCR) during the evolution of key members of this group. A clear linear increase in dental complexity over evolutionary time is apparent when complexity is measured at high resolution (125 to 175 rows per tooth). The taxa examined also show a linear scaling of OPCR with varying resolution. The slope of this relationship is also a key distinguishing factor among taxa, designated as OPCRS. We found that successive increases in dental complexity are due to the addition of finer-scale morphological features. The study sets the scene for a more detailed investigation into additional members of the Equidae.

© Finnish Zoological and Botanical Publishing Board 2014
Alistair R. Evans and Christine M. Janis "The Evolution of High Dental Complexity in the Horse Lineage," Annales Zoologici Fennici 51(1-2), 73-79, (1 April 2014).
Received: 11 November 2013; Accepted: 3 February 2014; Published: 1 April 2014
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