Transactions of the Royal Society of Edinburgh: Earth Sciences

Research Article

A reassessment of the temnospondyl amphibian Perryella olsoni from the Lower Permian of Oklahoma

Marcello Rutaa1 p1 and John R. Bolta2

a1 Department of Geology, The Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605-2496, USA E-mail: bolt@fieldmuseum.org

a2 Department of Geology, The Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605-2496, USA E-mail: mruta@fieldmuseum.org

ABSTRACT

Additional mechanical preparation of the type material of the temnospondyl amphibian Perryella olsoni (Lower Permian, Wellington Formation, Oklahoma) highlights new cranial and postcranial features and provides additional data on previously known structures. Important new information is available for the quadrate, palatal bones and their associated dentition, parasphenoid, and appendicular skeleton. The revised diagnosis and redescription of Perryella provide the basis for a re-evaluation of its systematic affinities. A cladistic analysis of (mostly) Carboniferous and Permian temnospondyls, together with several Devonian and Carboniferous stem tetrapod outgroups, supports a single origin for temnospondyls. The sequence of branching events within temnospondyls consists of: (1) a paraphyletic Edopoidea; (2) a clade of Zatracheidae, Eryopidae, and basal Archegosauriformes; (3) a monophyletic Dvinosauria; and (4) a monophyletic Dissorophoidea. Perryella is nested within Dvinosauria in an intermediate position between Trimerorhachidae and Dvinosauroidea.

(Received January 05 2006)

(Accepted November 07 2006)

KEY WORDS

  • Carboniferous;
  • characters;
  • Dissorophoidea;
  • Dvinosauroidea;
  • phylogeny;
  • Temnospondyli;
  • Triassic;
  • Trimerorhachidae

Correspondence:

p1 Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK E-mail: m.ruta@bristol.ac.uk