Parhabdolithus boletiformis Black, 1972
Black, M., (1972): British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). - Palaeontographical Society Monograph. 126: 1-48.
Crux, J. A., (1991): Albian calcareous nannofossils from the Gault Clay of Munday’s Hill (Bedfordshire, England). - Journal of Micropalaeontology. 10:203-221