Burgess Shale chordate

Lateral reconstruction of the primitive chordate, Pikaia gracilens, from the Middle Cambrian Burgess Shale of British Columbia. With the presence of a notochord along its back, this small worm-like precursor to the vertebrates is the earliest known repres

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Burgess Cambrian Chordate Columbia Columbian Extinct Extinction Fossil Fossilized Fossils Illustrated Illustration Illustrations Painting Paintings Paleozoic Period Prehistoric Prehistory Primitive Reconstruction Reconstructions Shale

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