Xenacanthus sharks

Xenacanthus sharks

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This image is part of the feature Sharks

Credit: CHRISTIAN DARKIN/SCIENCE PHOTO LIBRARY

Caption: Xenacanthus sharks. Artwork of two Xenacanthus sharks swimming. This genus of prehistoric shark existed during the late Devonian through to the Triassic period (410-220 million years ago). This species lived in freshwater and had a long spine protruding from the back of their head. It had unusual double forked front teeth and a ribbon-like dorsal fin giving it an eel-like appearance. Shark skeletons are made of cartilage and do not fossilise well. Most shark fossils consist of teeth and fin parts.

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Keywords: 2, animal, animals, artwork, biological, biology, cartilaginous fish, dorsal fin, duo, early shark, eel-like, elasmobranchii, fauna, fish, ichthyology, illustration, nature, pair, palaeontology, paleontology, prehistoric, prehistoric fish, prehistoric shark, prehistory, primitive shark, shark, sharks, spine, swimming, two, under water, underwater, vertebrate, vertebrates, wildlife, xenacanthus, xenacanthus shark, zoological, zoology

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