160
Journal of Paleontology 91(1):146–161
counterpart in the Early Cretaceous. Similarly, present evidence points to a significant extinction event during the Cenomanian– Turonian, exterminating all but theC. frazieri group. More work is needed to pinpoint the cause of this extinction, as well as to determine the relationships among post-Triassic North American lungfishes. Here, as in so many other cases, the most urgent need is for basic data—a need that can only be addressed by further field work.
Acknowledgments
For access to specimens in their care, we thank C. Beard, D. Burnham, M. Florence, J. Whitmore Gillette, L. Herzog, J. Krishna, R. Scheetz, V. Schneider, S. Underwood, and L. Zanno. We are grateful to A. Titus and D. Parris for various bits of information, and to R. Burkhalter and J. Cohen for help with photography and 3D digitalization. We also thank B. Grandstaff and L. Cavin for their thoughtful reviews, which greatly benefited this work. Partial support for this research was provided by grants from the National Geographic Society (4761-91, 5021-92, 5918-97, and W266-13) and the National Science Foundation (BSR 8906992, DEB 9401994, 9870173).
Accessibility of supplemental data As supplemental data, we provide 3D PDF files for most of the specimens illustrated herein. Data available from the Dryad Digital Repository:
https://doi.org/10.5061/dryad.v1jv1
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