Taxon - Links and literature
Paleobiology Database [132193]
Paleobiology Database [https://paleobiodb.org/] [as Protactis Spencer, 1927]
Data retrieved on: 11 December 2015
The Interim Register of Marine and Nonmarine Genera [1399420]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [as Protactis Spencer, 1927]
Data retrieved on: 29 November 2019