The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa
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Lamsdell, James C.
Briggs, Derek E. G.
Liu, Huaibao P.
Witzke, Brian J.
McKay, Robert M.
Funding for this research was provided by:
National Science Foundation (EAR 0922054, EAR 0921245)