Project 2116: J. C. Lamsdell,D. E. G. Briggs,H. P. Liu,B. J. Witzke,R. M. McKay. 2015. The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa. BMC Evolutionary Biology. 15 (169):1–31.
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Pentecopterus decorahensis