Callahan, W.R. & Schein, J.P. & Schroeter, E.R. & Parris, D.C. & Lacovara, K.J. (2012)
First record of the synechodontiform shark Sphenodus (Neoselachii, Orthacodontidae) from the Danian of North America [Abstract].
Journal of Vertebrate Paleontology, 32(Suppl. 1), 73 DOI: 10.1080/02724634.2012.10635175