Tetralithus quadrisphenus Worsley, 1971
Nannolith formed of four segments (tangential c-axis) having circular to the square in shape with diagonal sutures
Varol, O. & Jakubowski, M., (1989): Some new nannofossil taxa. - INA Newsletter. 11: 24-29.
Worsley, T. R., (1971): Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In, Farinacci, A. (ed.) - Proceedings of the Second Planktonic Conference Roma 1970. Edizioni Tecnoscienza, Rome 2: 1301-1321.