Type Species

Quadrilateris imparidividuus Varol, 1991


Youngilithus Bown, 2005


Bown, P. R., (2005): Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). - Journal of Nannoplankton Research. 27(1): 21-95

Varol, O., (1991): New Cretaceous and Tertiary Calcareous Nannofossils. - Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 182: 211-237.