Compagno, L. J. V., 1977, Phyletic relationships of living sharks and rays: American Zoologist, v. 17, p. 303-322.
Gilbert, P. W., Mathewson, R. F., and Rall, D. P., 1967, Sharks, Skates and Rays: Baltimore, Md., The Johns Hopkins Press.
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Compagno, L. J. V., 1977, Phyletic relationships of living sharks and rays: American Zoologist, v. 17, p. 303-322.
Gilbert, P. W., Mathewson, R. F., and Rall, D. P., 1967, Sharks, Skates and Rays: Baltimore, Md., The Johns Hopkins Press.