Cyclococcolithus aequiscutum Gartner, 1967
From Latin tenebrae, darkness, and lamina, a thin plate or sheet, referring to the characteristically dark shield of the coccolith.
Gartner, S., (1967): Calcareous nannofossils from Neogene of Trinidad, Jamaica, and Gulf of Mexico. - University of Kansas Paleontological Contributions, Papers. 29: 1-7.