Australian Journal of Zoology Australian Journal of Zoology Society
Evolutionary, molecular and comparative zoology
RESEARCH ARTICLE

New arthrodires (placoderm fishes) from the Aztec Siltstone (late Middle Devonian) of southern Victoria Land, Antarctica

Gavin C. Young A C and John A. Long B

A Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia.

B School of Biological Sciences, Flinders University, PO Box 2100, Adelaide, SA 5001, Australia.

C Corresponding author. Email: Gavin.Young@anu.edu.au

Australian Journal of Zoology 62(1) 44-62 http://dx.doi.org/10.1071/ZO13070
Submitted: 2 September 2013  Accepted: 30 December 2013   Published: 26 May 2014

Abstract

A small collection of arthrodire remains is described from the Devonian Aztec Siltstone of southern Victoria Land, Antarctica. Barwickosteus antarcticus, gen. et sp. nov., is a small phlyctaeniid arthrodire probably closely related to Barrydalaspis from the Bokkeveld Group of South Africa. Grifftaylor antarcticus, gen. et sp. nov., is a generalised phlyctaeniid resembling Phlyctaenius and Neophlyctaenius. New specimens of Boomeraspis show that it had a high-spired trunk-armour with a median dorsal plate of similar proportions to Tiaraspis, Mithakaspis, Turrisaspis or Africanaspis. Other fragmentary median dorsal plates are provisionally referred to Turrisaspis and Mulgaspis. With these new taxa the vertebrate assemblage from the Aztec Siltstone comprises at least 37 genera and 50 species, making it one of the most diverse of Middle–Late Devonian age.

Graphical Abstract Image


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