Project 2191: J. C. Lamsdell, D. E. Briggs, H. P. Liu, B. J. Witzke, R. M. McKay. 2015. A new Ordovician arthropod from the Winneshiek Lagerstätte of Iowa (USA) reveals the ground plan of eurypterids and chasmataspidids. The Science of Nature. 102 (9-10):null.
