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Osteological Features of Eurypterygian Pelvic Girdles

  • Yazdan KeivanyEmail author
Research Paper
  • 52 Downloads

Abstract

The osteology of the pelvic girdle skeleton in representatives of several families of eurypterygian fishes was studied. The pelvic girdle is made up of a pair of ventral plates (basipterygia). Each plate consists of a central part, a median process, a membranous anterior process, an endochondral posterior process, wings, radials, and pelvic spines and rays. Splints are present in some primitive taxa. The central part is an ossification of the original pelvic cartilage that usually anteriorly retains a cartilage tip and posteriorly forms an articulation surface for the fin radials and rays. The membranous wings constitute an internal, an external dorsal, an external ventral, and a ventral wing. Not all the processes and wings are present in all eurypterygian fishes. It is the elaboration and orientation of wings that leads to its complexity in higher fishes. Primitively, in euteleosts, there are a number of autogenous radials. The medialmost radial is the largest and associated or fused to the base of the innermost ray and other radials are autogenous.

Keywords

Bone Eurypterygia Osteology Pelvic fin Paired fins 

Notes

Acknowledgements

I wish to extend my sincere appreciation to late Professor J.S. Nelson, Professor P.R. Willoughby, Professor M.V.H. Wilson, Professor B.S. Heming, Professor G. Goss, and Dr. L.R. Parenti for providing the helpful comments and advice during the course of this study and to Mr. W.E. Roberts and the curators and staff of the Smithsonian Institution, California Academy of Sciences, and Australian Museum at Sydney for lending their fish specimens and Mr. R. Mandryk for preparing stains and other chemical solutions. This study was financially supported by a MCHE scholarship to the author and an NSERC grant to Dr. J.S. Nelson and Isfahan University of Technology.

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Copyright information

© Shiraz University 2017

Authors and Affiliations

  1. 1.Department of Natural Resources (Fisheries Division)Isfahan University of TechnologyIsfahanIran

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