Science Advances

The PDFset includes:

• Supplementary Text
• Fig. S1. CT scan reconstructions disarticulating individual cranial elements of Najash (MPCA 500).
• Fig. S2. Morphological data–only Bayesian inference analysis of dataset 2.
• Fig. S3. Morphological data–only maximum parsimony analysis of dataset 2.
• Fig. S4. Combined evidence relaxed-clock Bayesian inference analysis of dataset 2.
• Fig. S5. Maximum parsimony analysis of dataset 1.
• Fig. S6. Bayesian analysis of dataset 1.
• Table S1. Measurements (length in millimeters) of the preserved portion of the selected elements of the described specimens.
• Table S2. Stratigraphy and age for the newly included fossil taxa used for tip-dating calibrations.
• Table S3. Accession numbers for the sampled molecular data for the additional extant taxa included here relative to the molecular data available in Simões et al. (25).
• Legends for movies S1 to S3
• Legends for data files S1 to S4
• References (41–71)

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Other Supplementary Material for this manuscript includes the following:

• Movie S1 (.mp4 format). Micro-CT scan video of Najash skull MPCA 500, pitch mode.
• Movie S2 (.mp4 format). Micro-CT scan video of Najash skull MPCA 500, roll mode.
• Movie S3 (.mp4 format). Micro-CT scan video of Najash skull MPCA 500, yaw mode.
• Data file S1. Nexus file for morphological phylogenetic ingroup dataset, with MrBayes command used for uncalibrated Bayesian analysis.
• Data file S2. (Nexus_File_Dataset2_Combined_MrBayes) Nexus file for combined phylogenetic diapsid-squamate dataset with MrBayes command used for uncalibrated Bayesian analysis.
• Data file S3. (Nexus_File_Dataset2_Combined_MrBayes_Clock) Nexus file for combined phylogenetic diapsid-squamate dataset with MrBayes command used for relaxed-clock Bayesian analysis.
• Data file S4. (Nexus_File_Dataset2_MorphologyOnly) Nexus file for morphological phylogenetic diapsid-squamate dataset.