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A new genus and species of Ptyctodont (Placodermi) from the Late Devonian Gneudna Formation, Western Australia, and an analysis of Ptyctodont phylogeny

Published online by Cambridge University Press:  15 July 2009

KATE TRINAJSTIC*
Affiliation:
WA Organic and Isotope Geochemistry Centre, Department of Applied Chemistry, Curtin University of Technology, Bentley, Western Australia 6845, Australia
JOHN A. LONG
Affiliation:
Museum Victoria, PO Box 666, Melbourne, Victoria 3001, Australia Research School of Earth Sciences, The Australian National University, Camberra 0200, Australia
*
*Author for correspondence: K.Trinajstic@curtin.edu.au

Abstract

An almost complete but predominantly disarticulated ptyctodont fish, Kimbryanodus williamburyensis n. gen., n.sp. from the Late Devonian Gneudna Formation, is described. The fossils occur as three-dimensionally preserved isolated plates, and this has allowed the reconstruction of the fish. A taxonomic revision of the ptyctodonts was undertaken based on recently described Australian taxa and new reconstructions of Australian, American and European specimens. The phylogenetic analysis supports a threefold division of the ptyctodonts, with Rhamphodopsis being the most basal taxon and the other ptyctodonts divided into those possessing a median dorsal spine, spinal plate and simple V-shaped overlap of the anterior lateral and anterior dorsolateral plates and those taxa which do not.

Type
Original Article
Copyright
Copyright © Cambridge University Press 2009

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