Evolution and extinction of a paleozoic crinoid clade: phylogenetics, paleogeography, and environmental distribution of the periechocrinids. Ausich, William I.; Webster, Gary D.[Eds]. Echinoderm paleobiology. [Life of the Past.], Indiana University Press, Bloomington & Indianapolis, 2008: i-xii, 1-456. Chapter pagination: 146-171. 161 [Zoological Record Volume 144]