Journal reference: James C. Lamsdell, Derek E. G. Briggs, Huaibao P. Liu, Brian J. Witzke, Robert M. McKay. The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa. BMC Evolutionary Biology, 2015; 15 (1) DOI: 10.1186/s12862-015-0443-9 Eurypterids are a diverse group of chelicerates known from ~250 species with a […]