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Selden, P.A.; Shear, W.A. & Sutton, M.D. (2008), "Fossil evidence for the origin of spider spinnerets, and a proposed arachnid order", Proceedings of the National Academy of Sciences, 105 (52): 20781–20785, doi:10.1073/pnas.0809174106, PMC2634869, PMID19104044