Helicosphaera bipuncta de Kaenel & Bergen in Boesiger et al., 2017
Boesiger, T. M., de Kaenel, E., Bergen, J. A., Browning, E., Blair, S. A. , 2017. Oligocene to Pleistocene taxonomy and stratigraphy of the genus Helicosphaera and other placolith taxa in the circum North Atlantic Basin. - Journal of Nannoplankton Research 37(2-3), 145-175.
Helicosphaera bipuncta
de Kaenel & Bergen, in Boesiger et al., 2017
Early Miocene
ODP Leg 154, Hole 925A, Ceará Rise, Equatorial Atlantic Ocean