ACKNOWLEDGEMENTS

We thank the coordinators of the Digital Symposium at the 66^th Annual Society of Vertebrate Paleontology Meetings for allowing us to present preliminary results from this study. We also thank C.J. Bell for his comments on the manuscript. D. Kelly and M. Manning constructed post scan data sets. Funding was provided by NSF EAR 0236775, NSF DEB 0315963, SICB Student Support, and the All Catfish Species Inventory.