Opabinia regalis Walcott, 1912 Dorsal view of a male specimen, flattened in the shale, showing fp = frontal appendage, e = eye, ths = thoracic somites, i = intestine, ab = abdominal segment. U. S. National Museum, Catalogue No. 57684. 1912 49 Opabinia regalis - Walcott Cambrian Geology and Paleontology II plate 28

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