Munarinus emrei Varol 1989a.
From the Greek diorofos toichos, meaning two-storey wall, referring to its characteristic two-crystalline-high wall.
This elliptical holococcolith features a two-crystalline high wall surrounding a central area filled with a disjunct structure. Each storey consists of about eight crystalline units.
In the plan views, the disjunct central structure and the wall display symmetrical extinction lines at an angle of approximately 45 °, indicative of a rhombohedral crystal structure.
Diorofostoichos can be distinguished from the other two-storey genera, Didimospyrgos and Perideraiolithos, by its symmetrical extinction lines, in contrast to the inclined extinction lines seen in Didimospyrgos and Perideraiolithos. Furthermore, Diorofostoichos is differentiated from Munarius, Multipartis, and Russelia by its two-crystalline-high wall structure, whereas these latter genera possess one-crystalline-high walls.
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Varol, O. 1989c. Palaeocene calcareous nannofossil biostratigraphy. In: Crux, J. A. & van Heck, S. E. (Eds), Nannofossils and their applications. Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series 265-310.
Varol, O. 2025b. New observation on Paleocene holococcoliths. Neues Jahrbuch für Geologie und Paläontologie,