Giersch, S. & Frey, E. & Ifrim, C. & Stinnesbeck, W. & Gonzales Gonzales, A.H. (2010)
Ptychodontid sharks from the Upper Cretaceous locality Vallecillo (North-eastern Mexico) [Abstract]. In Fifth international meeting on Mesozoic fishes – Universidad Autonoma de Estado de Hidalgo: 43