Fossils - Deuterostomia - Chordata - Chondrichthyes - Shark Xenacanthus texensis - Permian.

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Photo credit: © De Agostini / G. Cigolini / Alamy / Afripics
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Keywords: animal, chordata, close-, deuterostomia, devonian, extinct, fish, fossil, fossils, frame, full, geology, gray, history, horizontal, paleontology, people, permian, representation, rock, sealife, shark, themes