Helenea staurolithina Worsley, 1971
Microstaurus Black, 1971
Black, M., (1971): Coccoliths of the Speeton Clay and Sutterby Marl. - Proceedings of the Yorkshire Geological Society. 38: 381-424.
Worsley, T.R., (1971): Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In: Farinacci, A. (Editor), Proceedings of the Second Planktonic Conference Roma 1971. Edizioni Tecnoscienza, Rome, pp. 1301-1321.