Early loss and multiple return of the lower temporal arcade in diapsid reptiles (original) (raw)

Abstract

The temporal arches of diapsid reptiles have received attention for several decades. In particular, it has been observed that the lower temporal bar at the ventral margin of the cheek is frequently reduced due to the absence of a contact between jugal and quadratojugal. The loss of the arcade was formerly considered to be of high systematic value, but is now often interpreted as being autapomorphic for the respective taxon, and the presence of both arcades is generally regarded as a plesiomorphic feature. Here I show, based on a cladistic analysis as well as on further anatomical evidence, that the lower temporal arcade was lost only once in diapsid evolution, and that the presence of the arch in "higher" diapsids is secondary, which is indicated by the different ratio between jugal and quadratojugal as well as by ontogeny. This result also sheds new light on the understanding of the cheek configuration of enigmatic taxa such as ichthyosaurs and turtles.

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Acknowledgements

I wish to thank J.A. Boy (Mainz), M. Laurin (Paris), J.W. Merck (Maryland), O. Rieppel (Chicago), and P.M. Sander (Bonn) for useful comments, and I. Mueller-Töwe (Mainz) for technical help. The study was supported by the Studienstiftung des Deutschen Volkes and the Graduiertenförderung Mainz.

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1. Department of Biology, University of Toronto at Mississauga, 3359 Mississauga Rd N, Mississauga, ON, L5L 1C6, Canada
   Johannes Müller

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Müller, J. Early loss and multiple return of the lower temporal arcade in diapsid reptiles.Naturwissenschaften 90, 473–476 (2003). https://doi.org/10.1007/s00114-003-0461-0

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• Received: 11 December 2002
• Accepted: 02 August 2003
• Published: 18 September 2003
• Issue Date: October 2003
• DOI: https://doi.org/10.1007/s00114-003-0461-0

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