Chiastozygus striatus Black, 1971
Black, M., (1971): Coccoliths of the Speeton Clay and Sutterby Marl. - Proceedings of the Yorkshire Geological Society. 38: 381-424.
Varol, O. & Girgis, M., (1994): New taxa and taxonomy of some Jurassic to Cretaceous calcareous nannofossils. - Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 192: 221-253.