Bifidalithus geminicatillus Varol, 1991
The holococcolith is characterised by two crystalline blocks separated by a distinct suture along the short axis, supporting a distal process and surrounded by a narrow wall.
The crystalline blocks are in constant extinction, whereas the wall exhibits a greyish-white interference colour.
Varol, O. 1991. New Cretaceous and Tertiary Calcareous Nannofossils. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen 182: 211-237.