Taxon - Links and literature
Prokop R. J., Petr V. (1990): Type Specimens of Fossils in the National Museum of Prague: Paleozoic Crinoidea, National Museum Prague [as Parapisocrinus ollula ollula (Angelin, 1878)]
Prokop R. J., Petr V. (1990): Type Specimens of Fossils in the National Museum of Prague: Paleozoic Crinoidea, National Museum Prague [as Parapisocrinus ollula ollula (Angelin, 1878)]