This work was supported by Aberdeen University, the Marine Biological Association and Save Our Seas Foundation (SOSF). We thank Mr Oliver Crimmen, Dr Colin MacLeod, Dr Sharon Mitchell and Patricia Crombie for their support, Dr Takashi Sawada for valuable comments on elasmobranch tooth formation and Professor Richard Aspden for use of the freezer mill for grinding osteodentine. Thanks to Steffano Vanni, Giuseppe Guarrasi, Enrico Bellia, Helmut Wellendorf, Radek Šanda, Peter Adamik and Georges Lenglet for allowing access to material from museum and private collections.
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