Taxon - Links and literature
Echinoid Directory [1542]
Smith A. B. (ed.) (2005): Echinoid Directory [http://www.nhm.ac.uk/research-curation/p...], Natural History Museum, London [as Polycyphus]
Data retrieved on: 4 March 2016
Paleobiology Database [32981]
Paleobiology Database [https://paleobiodb.org/] [as Polycyphus Agassiz & Desor, 1846]
Data retrieved on: 11 December 2015
The Interim Register of Marine and Nonmarine Genera [1350165]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [as Polycyphus L. Agassiz in Agassiz & Desor, 1846]
Data retrieved on: 29 November 2019