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Butterflies from the Middle Eocene: The Earliest Occurrence of Fossil Papilionoidea (Lepidoptera)
(Texas Memorial Museum, The University of Texas at Austin, 1978)
Three fossil butterflies recently collected from the Green River Shale of Colorado extend the known range of Rhopalocera eight to ten million years back, to 48 Ma. Praepapilio Colorado n. g., n. sp., and P. gracilis n. ...