Varolia cistula Bown, 2005d
Varolia exhibits parallel extinction (extinction angle of 0 °) with length-slow (+) elongation.
Holococcolith consist of a crystalline-high wall that encloses the void central area.
Bown, P. R. 2005d. 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.