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Article: Cladistic analysis of Caseidae (Caseasauria, Synapsida): using the gap‐weighting method to include taxa based on incomplete specimens

Palaeontology - Vol. 58 Part 6 - Cover Image
Publication: Palaeontology
Volume: 58
Part: 6
Publication Date: November 2015
Page(s): 1109 1130
Author(s): Marco Romano, and Umberto Nicosia
Addition Information

How to Cite

ROMANO, M., NICOSIA, U. 2015. Cladistic analysis of Caseidae (Caseasauria, Synapsida): using the gap‐weighting method to include taxa based on incomplete specimens. Palaeontology, 58, 6, 1109-1130. DOI: 10.1111/pala.12197

Author Information

  • Marco Romano - ‘Sapienza’ Università di Roma Dipartimento di Scienze della Terra Rome Italy (Email: marco.romano@uniroma1.it)
  • Marco Romano - Sam Noble Museum Norman OK USA
  • Umberto Nicosia - ‘Sapienza’ Università di Roma Dipartimento di Scienze della Terra Rome Italy (Email: umberto.nicosia@uniroma1.it)

Publication History

  • Issue published online: 27 October 2015
  • Article first published online: 01 January 1970
  • Manuscript Accepted: 27 July 2015
  • Manuscript Received: 19 November 2014

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Abstract

Occupying the role of primary consumer and having an early–middle Permian age range, caseids (Caseasauria, Synapsida) are fundamental to the interpretation of the early history of terrestrial vertebrate ecosystems. Despite this importance, no comprehensive, species‐level phylogenetic study of Caseidae has yet been performed. Herein, we present a phylogenetic analysis of the group, using gap weighting to include poorly known taxa. Besides the description and comments on the resultant topologies, some more general issues concerning cladistic methodologies are briefly addressed. This study highlights the importance of a total‐evidence approach, including as many within‐group taxa and characters as possible. Continuously varying characters, in the form of indices derived from measurement of individual skeletal elements, proved to be highly important, adding significantly to the resolution of, and support for, recovered trees. The utility of the postcranial skeleton in understanding relationships among basal synapsids is highlighted.

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