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Ordovician rhipidognathid conodonts from Australia and Iran

Published online by Cambridge University Press:  20 May 2016

Yong Y. Zhen ,
Robert S. Nicoll ,
Ian G. Percival ,
Mir Alireza Hamedi  and
Ian Stewart
Yong Y. Zhen
Affiliation:
1Centre for Ecostratigraphy and Palaeobiology, Department of Earth and Planetary Sciences, Macquarie University, New South Wales 2109, Australia
Robert S. Nicoll
Affiliation:
2Department of Geology, Australian National University, Canberra ACT 0200, Australia
Ian G. Percival
Affiliation:
3Geological Survey of New South Wales, P.O. Box 76, Lidcombe, New South Wales 2141, Australia
Mir Alireza Hamedi
Affiliation:
46 Vaezi-Toobaee Street, Shemiran 19339, Tehran, Iran
Ian Stewart
Affiliation:
5School of Biological Sciences, Monash University, Clayton, Victoria 3168, Australia
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Abstract

Based on specimens from Australia and Iran, five species of rhipidognathid conodonts, Appalachignathus delicatulus Bergström, Carnes, Ethington, Votaw, and Wigley, 1974, Bergstroemognathus extensus (Graves and Ellison, 1941), B. hubeiensis An (MS) in An, Chen, and Li, 1981, B. kirki Stait and Druce, 1993, and Rhipidognathus? yichangensis (Ni, 1981), are described and revised in terms of multielement morphology. All three genera comprising the Rhipidognathidae are interpreted as having a septimembrate apparatus, partially confirmed by bedding plane assemblages of B. extensus from Victoria. Occurrence of A. delicatulus in allochthonous limestones (about the Middle-Upper Ordovician boundary) of central New South Wales is the first record of the species outside North America. Recognition of Rhipidognathus? yichangensis in Early Ordovician strata of the Canning Basin, reinforces biogeographic affinities of Australia and South China. The three described species of Bergstroemognathus are mainly restricted to late Early Ordovician strata. Bergstroemognathus extensus is widely distributed in North America, western Argentina (Precordillera), China, and Australia. Bergstroemognathus hubeiensis, described from east-central Iran, has been previously recorded only from China, while the slightly younger B. kirki seems endemic to central and northern Australia, where it was restricted to shallow, warm water environments. In contrast, B. extensus and B. hubeiensis inhabited a spectrum of water depths from shallow to deep.

Type
Research Article
Information
Journal of Paleontology , Volume 75 , Issue 1 , January 2001 , pp. 186 - 207
Copyright
Copyright © The Paleontological Society

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Footnotes

*

Present address: Division of Earth & Planetary Sciences, The Australian Museum, 6 College St, Sydney New South Wales 2010, Australia <[email protected]>

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