Taxon - Odkazy a literatura
The Interim Register of Marine and Nonmarine Genera [1341986]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Cryptogemma Dall, 1918]
Datum citace: 30. listopad 2019
Paleobiology Database [115970]
Paleobiology Database [https://paleobiodb.org/] [jako Cryptogemma Dall, 1918]
Datum citace: 13. prosinec 2015
Paleobiology Database [115912]
Paleobiology Database [https://paleobiodb.org/] [jako Pinguigemmula MacNeil, 1960]
Datum citace: 25. leden 2018