Preliminary phylogenetic analysis and stratigraphc congruence of the dicynodont anomodonts (Synapsida: Therapsida)

Show simple item record Angielczyk, Kenneth D 2015-01-09T12:57:22Z 2015-01-09T12:57:22Z 2001
dc.identifier.issn 0078-8554
dc.description.abstract A preliminary phylogenetic analysis of 20 well-known dicynodont taxa was conducted using modern cladistic methods. Many past phylogenetic hypotheses were corroborated, but others conflict with the results of this analysis. Most notably, Diictodon, Robertia, and Pristerodon are reconstructed in more basal positions than previously suggested, whereas Endothiodon and Chelydontops occupy a more crown ward position. These findings are consistent with novel evolutionary scenarios for characters such as the presence of postcanine teeth and anterior palatal ridges. The Relative Completeness Index and Gap Excess Ratio were used to examine the degree of fit between the most parsimonious cladograms of this study and the stratigraphic record of the dicynodonts. Although the results of this analysis suggest that the preferred cladogram is relatively consistent with stratigraphy, the presence of some ghost ranges and ghost lineages imply that the fossil record of dicynodonts is not as complete as is sometimes stated. These findings are important because there is a long tradition of intensive collecting in regions where dicynodont fossils are common; sections of several dicynodont lineages may not be preserved in these areas. en_ZA
dc.description.sponsorship The Council's Research Committee, University of the Witwatersrand; National Research Foundation (NRF); Palaeo-Anthropology Scientific Trust (PAST); Collections Usage Grant (AMNH); Grant-in-Aid-of Research (Berkeley Chapter of Sigma Xi);Samuel P. Welles Fund of the UCMP en_ZA
dc.language.iso en en_ZA
dc.publisher Bernard Price Institute for Palaeontological Research en_ZA
dc.subject dicynodontia en_ZA
dc.subject phylogeny en_ZA
dc.subject stratigraphy en_ZA
dc.subject anomodontia en_ZA
dc.subject synapsida en_ZA
dc.subject Karoo Basin en_ZA
dc.title Preliminary phylogenetic analysis and stratigraphc congruence of the dicynodont anomodonts (Synapsida: Therapsida) en_ZA
dc.type Article en_ZA

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