Supplemental Data 1
Canadian Journal of Earth Sciences
The first substantive evidence of Utatsusaurus (Ichthyopterygia) from the Sulphur Mountain Formation (Lower–Middle Triassic) of British Columbia, Canada: a skull roof description with comparison to other early taxa
Robin S. Cuthbertson, Anthony P. Russell, and Jason S. Anderson
R.S. Cuthbertson1 and A.P. Russell.Department of Biological Sciences, University of Calgary, 2500 University Drive, Calgary, Alberta, T2N 1N4, Canada.
J.S. Anderson. Department of Comparative Biology and Experimental Medicine, University of Calgary, 3330 Hospital Drive, Calgary, Alberta, T2N 4N1, Canada.
1Corresponding author (email: email@example.com).
Supplemental data 1. Description of characters used in phylogenetic analysis (modified from Motani 1999a; Thorne et al. 2011; Cuthbertson et al. 2013a).
(1) Premaxilla posterior end: (0) concave and the dorsal process is longer than the ventral; (1) pointed, scarcely entering the external naris; (2) concave and the ventral process is longer than the dorsal.
(14) Anterior terrace of supratemporal fenestra: (0) absent; (1) present, but small, reaching the posterior part of the frontal anteriorly; (2) present, and large, reaching the nasal anteriorly.
(15) Frontal widest position: (0) located posteriorly; (1) at nasal suture.
(16) Sagittal eminence: (0) absent; (1) present but small, involving only the parietal; (2) present and large, involving the parietal, frontal, and nasal.
(17) Parietal ridge: (0) absent; (1) present.
(18) Parietal supratemporal process: (0) short; (1) long; (2) parietal and supratemporal separated by an additional skull bone.
(19) Right and left parietal’s anterior processes: (0) contacting each other anteriorly, eliminating frontal from pineal foramen; (1) narrowly separated anteriorly, forming parietal fork, and frontal dorsally visible along the pineal foramen; (2) widely open, resulting in absence of clear fork.
Cuthbertson, R., Russell, A., and Anderson, J. 2013. Cranial morphology and relationships of a new grippidian (Ichthyopterygia) from the Vega-Phroso Siltstone Member (Lower Triassic) of British Columbia, Canada. The Journal of Vertebrate Paleontology, 33: 831–847.
Motani, R.1999a. Phylogeny of the Ichthyopterygia. Journal of Vertebrate Paleontology, 19: 473–496.
Thorne, P.M., Ruta, M., and Benton, M.J. 2011. Resetting the evolution of marine reptiles at the Triassic-Jurassic boundary. Proceedings of the National Academy of Sciences of the United States of America, 108: 8339–8344.