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3 - The Ordovician Enigma

Fish, First Appearances and Phylogenetic Controversies

Published online by Cambridge University Press:  31 December 2018

By
Ivan J. Sansom  and
Plamen S. Andreev
Edited by
Zerina Johanson ,
Charlie Underwood  and
Martha Richter
Zerina Johanson
Affiliation:
Natural History Museum, London
Charlie Underwood
Affiliation:
Birkbeck, University of London
Martha Richter
Affiliation:
Natural History Museum, London
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Summary

The Ordovician history of fish is limited by a combination of biological, environmental and taphonomic constraints but appears to contain significant milestones referencing the first appearances of a number of major groups, including putative jawed fish. In addition, the depositional settings from which fish are recovered are restricted to a narrow range of environments, and, similarly, the stratigraphic coverage remains patchy despite increases in reporting over recent years. The Gondwanan and Laurentian record further diminishes with the onset of the end-Ordovician glaciation and concomitant extinction event, a pattern which continues into ‘Talimaa’s Gap’ at the base of the Silurian. Phylogenetically, many of the Ordovician taxa are problematic to place in the higher taxonomic groupings that dominate the Siluro-Devonian. With caution, a number of the scale-based taxa fall within the crown-gnathostomes, re-emphasizing the importance of the Great Ordovician Biodiversification Event in setting the scene for subsequent vertebrate evolutionary radiations and range expansions.

Type
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Evolution and Development of Fishes , pp. 59 - 70
Publisher: Cambridge University Press
Print publication year: 2019

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