The present 3D Dataset contains the 3D models analyzed in "Neenan, J. M., Reich, T., Evers, S., Druckenmiller, P. S., Voeten, D. F. A. E., Choiniere, J. N., Barrett, P. M., Pierce, S. E. and Benson, R. B. J. Evolution of the sauropterygian labyrinth with increasingly pelagic lifestyles. Current Biology, 27." https://doi.org/10.1016/j.cub.2017.10.069