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According to vertebrate paleontologist Todd Cook, associate professor of biology, Penn State Behrend, the team did not set out to contribute to the debate about the origins of teeth. Instead, he and his colleagues were studying the tissue structure of rostral denticles, which are the jagged spikes that run along the elongated snouts of sawsharks and sawfishes and are used in foraging and self-defense. Cook, who is the lead author of the study, which appears in the Journal of Anatomy, noted that sawfishes belong to the same group as skates and rays and are closely related to sharks. Lab Manager — Sawfish Fossils Suggest Teeth Likely Evolved from Body Scales in Ancient Fish | Lab Manager