Tribrachiatus orthostylus Shamrai, 1963.
Shamrai, I. A., (1963): Nekotorye formy verkhnemelovykh i paleogenovykh kokkolitov i disko_asterov na yuge russkol platformy [Certain forms of Upper Cretaceous and Paleogene coccoliths and discoasters from the southern Russian Platform]. - Izvestiya Vysshikh Uchebnykh Zavedeniy Geologiya i Razvedka. 6(4): 27-40.