García-Alcalde, J.L. 2021. New data on Cryptonella truyolsi García-Alcalde, 1999, cryptonellid (Terebratulidina) of the Cantabrian Mountains (N Spain). Spanish Journal of Palaeontology. 18, 2 (sep. 2021), 185–188. DOI:https://doi.org/10.7203/sjp.18.2.21646.