Figure 24. Punnett square showing the topological results within Titanosauria after re-analysis of the original Zaher et al. (2011) data matrix with and without rescored data for Tapuiasaurus and Isisaurus. Tapuiasaurus was fully rescored based on the present study; in addition, cranial data for Isisaurus were added, based on previous study of original materials (see Wilson et al., 2005). Re-analysis including only the rescored Tapuiasaurus data (lower left) yields the same topology as the original matrix, which includes an intact Nemegtosauridae (*; upper left). Re-analysis adding only the new Isisaurus data (upper right) supports the grouping of Tapuiasaurus + Rapetosaurus but does not unequivocally support the monophyly of the three nemegtosaurid taxa (in bold type) because Nemegtosaurus (N) is alternatively placed as the sister group of the Tapuiasaurus + Rapetosaurus clade or Isisaurus. Re-analysis using both new Isisaurus data and rescored Tapuiasaurus data (lower right) disbands the three nemegtosaurid taxa, with Nemegtosaurus (N) positioned more tipward and Tapuiasaurus (T) positioned more stemward. CSSI, Character State Similarity Index (Sereno, 2009), which measures similarity between matrices that score the same characters (see text for explanation). Abbreviations: Nemegto., Nemegtosaurus; Tapuia., Tapuiasaurus.