Iguanodontian taxa (dinosauria: Ornithischia) from the lower Cretaceous of England and Belgium

Norman, D. B. (2012) Iguanodontian taxa (dinosauria: Ornithischia) from the lower Cretaceous of England and Belgium. In: Bernissart Dinosaurs and Early Cretaceous Terrestrial Ecosystems. Life of the Past . Indiana University Press, pp. 175-212. ISBN 978-0-253-35721-2

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Abstract

This review summarizes current understanding of the history, anatomy, and taxonomy of British and Belgian iguanodontian dinosaurs. The earliest iguanodontian from this circumscribed region is Berriasian in age and represented by a well-preserved but crushed dentary with many teeth in situ; originally named Iguanodon hoggii Owen, 1874, this specimen has been studied and reassessed several times, and decisions concerning its taxonomic status and systematic position have proved to be consistently inconclusive. I. hoggii has recently been renamed Owenodon hoggii; however, the diagnostic anatomical characters that form the foundation for this new name are few and not taxonomically or systematically robust. It is considered appropriate to regard this undoubtedly important taxonomic entity as indicative of a basal (ankylopollexian) iguanodontian and to encourage new exploration for additional skeletal remains from Berriasian-aged deposits in England. Wealden iguanodontian taxonomy in England has also begun to be scrutinized more thoroughly. Difficulties encountered when trying to diagnose the original (Valanginian) type genus (Iguanodon Mantell, 1825) and species (Iguanodon anglicus Holl, 1829) created problems that were resolved using a rather unfortunate workaround that involved the use of a Barremian-Lower Aptian species: I. bernissartensis Boulenger in Van Beneden 1881. With regard to remains collected from numerous Wealden localities in southern England, it was recognized that known iguanodontians can be subdivided into anatomically and chronologically distinct groupings: an earlier (Valanginian) \"fauna\" represented by Barilium dawsoni (Lydekker, 1888) and Hypselospinus fittoni (Lydekker, 1889), and a later (Barremian-Lower Aptian) \"fauna\" comprising Iguanodon bernissartensis Boulenger in Van Beneden, 1881, and Mantellisaurus atherfieldensis (Hooley, 1925). The Belgian locality at Bernissart, assigned to the Sainte-Barbe Clays Formation (late Barremian-Lower Aptian) has yielded two taxa that have been recognized as anatomically similar to those identified in the contemporaneous Wealden deposits of southern England (the Weald Clay Group of the Wealden District and the Wealden Group of the Isle of Wight). Recent suggestions that further taxa can be diagnosed within the English and Belgian Wealden sequences are assessed (and rejected) on the basis of the evidence presented. © 2012 by Indiana University Press. All rights reserved.

Item Type: Book Section
Uncontrolled Keywords: 2012AREP; IA63;
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
Page Range: pp. 175-212
Depositing User: Sarah Humbert
Date Deposited: 30 Jun 2015 15:05
Last Modified: 30 Jun 2015 15:05
URI: http://eprints.esc.cam.ac.uk/id/eprint/3324

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