Leidy, J. (1859)
Descriptions of Xystracanthus arcuatus and Cladodus occidentalis. Proceedings of the Academy of Natural Sciences of Philadelphia, (unnumbered volume), 3

Schnetz, L. & Dunne, E.M. & Feichtinger, I. & Butler, R.J. & Coates, M.I. & Sansom, I.J. (2024)
Rise and diversification of chondrichthyans in the Paleozoic. Paleobiology, in press
DOI: 10.1017/pab.2024.1