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Shadows in the Sea, Philadelphia, Chilton Books [1963], shark, Woods Hole, Chondrichthyes, prehistoric animals, prehistoric shark, Cladoselache, Cladoselache fyleri, An illustration accompanying a detailed description of prehistoric sharks, specifically the Cladoselache species, which existed during the Devonian period. The text explores the anatomy and fossil discoveries of Cladoselache, highlighting its structure and evolutionary significance. It notes the absence of vertebrae in their fossilized remains, along with their slender form and long, sharp teeth, which were adapted for a carnivorous diet. The passage emphasizes the evolutionary shift from primitive to modern sharks, detailing changes in body structure and ecological roles over millions of years. Additionally, it contrasts the features of ancient sharks with their contemporary relatives, providing insight into the development of these marine predators throughout history. (Photo by: Sepia Times/Universal Images Group via Getty Images)