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Lamsdell, J. C., Briggs, D. E. G., Liu, H. P., Witzke, B. J. and McKay, R. M. 2015. The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa. BMC Evolutionary Biology. Vol. 15(169), p. 1–31.