Helicosphaera seminulum lophota Bramlette & Sullivan, 1961
Helicosphaera lophota (Bramlette & Sullivan, 1961) Locker, 1973
Helicosphaera neolophota Bukry in Barron et al. (1984)
Aubry, M. -P. & Bord, D. 2009. Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary. In: Koeberl, C., Montanari, A. (eds), The Late Eocene Earth-Hothouse, Icehouse, and Impacts. Geological Society of America, Special Papers 452: 279-301.
Barron, J. A., Bukry, D. & Poore, R. Z. 1984. Correlation of the middle Eocene Kellogg Shale of Nothern California. Micropaleontology 30(2): 138-170.
Bramlette, M. N., Sullivan, F. R., 1961, Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology 7(2), 129-188.
Locker, S., 1973. Coccolithineen aus dem Paläogen Mitteleuropas. Paläobotanik 3, 735-836.
Helicosphaera seminilum lophota
Bramlette & Sullivan, 1961
Middle Eocene
Lodo section, northwestern Fresno County, central California, USA