Radiolithus planus Stover, 1966
Rhombogyrus Black, 1973
Black, M., 1973. British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph 127, 49-112.
Stover, L. E., 1966. Cretaceous coccoliths and associated nannofossils from France and the Netherlands. Micropaleontology 12(2), 133-167.