Читать книгу Hadrosaurs - David A. Eberth - Страница 122

The phylogeny of hadrosauroids has undergone major revisions in the last decade, as numerous new taxa have been discovered and described. A number of large-scale, taxonomically inclusive phylogenetic analyses have also been conducted (e.g., You et al., 2003; Horner et al., 2004; Norman, 2004; Evans and Reisz, 2007; Sues and Averianov, 2009; Prieto-Márquez, 2010b; Godefroit, Bolotsky, and Lauters, 2012; Godefroit, Escuillié, et al., 2012; McDonald, 2012; Wu and Godefroit, 2012). In order to provide a preliminary hypothesis with regard to the phylogenetic position of Plesiohadros, the type and referred material were scored into a modified version of the data matrix published by Sues and Averianov (2009). The analysis of Prieto-Márquez (2010b) and modifications thereof were not considered because most iterations have focused on more derived hadrosauroids. The Sues and Averianov (2009) matrix was expanded to include the recently described taxa Jinzhousaurus yangi and Tethyshadros insularis, which were scored for all characters in the matrix using descriptions in the literature (Barrett et al., 2009; Dalla Vecchia, 2009; Wang et al., 2011). The majority of character scorings were left unchanged (although some scorings for specific taxa were modified, see data matrix in Appendix 7.1). All characters were considered unordered. The character matrix for the analysis includes 42 taxa and 138 characters. The data matrix was analyzed using TNT (Goloboff et al., 2008) under the default setting TBR branch-swapping algorithm with 10,000 random addition sequences. Bremer Decay and bootstrap analyses were conducted to assess the robustness of the results.