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

Ruta, Marcello and Bolt, John R. (2006) A reassessment of the temnospondyl amphibian Perryella olsoni from the Lower Permian of Oklahoma. Transactions of the Royal Society of Edinburgh: Earth Sciences, 97 (2). pp. 113-165. ISSN 1755-6910

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Official URL: http://dx.doi.org/10.1017/S0263593300001437

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.

Item Type:Article
Additional Information: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.
Keywords:Carboniferous, characters, Dissorophoidea, Dvinosauroidea, phylogeny, Temnospondyli, Triassic, Trimerorhachidae
Subjects:C Biological Sciences > C300 Zoology
C Biological Sciences > C182 Evolution
F Physical Sciences > F641 Palaeontology
C Biological Sciences > C181 Biodiversity
Divisions:College of Science > School of Life Sciences
ID Code:6721
Deposited By: Marcello Ruta
Deposited On:28 Oct 2012 21:46
Last Modified:13 Mar 2013 09:18

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