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Keywords from Image Description:
Opabinia regalis Walcott Cambrian Geology and Paleontology II plate . Opabinia regalis Walcott Dorsal view of male specimen flattened in the shale showing fp frontal appendage eye ths thoracic somites intestine ab abdominal segment National Museum Catalogue No Charles Walcott Middle Cambrian Branchiopoda Malacostraca Trilobita