Sphenolithus microdelphix Bergen & de Kaenel in Bergen et al., 2017
Bergen, J. A., de Kaenel, E., Blair, S. A., Boesiger, T. M., Browning, E., 2017. Oligocene-Pliocene taxonomy and stratigraphy of the genus Sphenolithus in the circum North Atlantic Basin: Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research 37(2-3), 77-112.
Sphenolithus microdelphix
Bergen & de Kaenel in Bergen et al., 2017
Late Oligocene
ODP Leg 154, Hole 929A, Ceará Rise, western equatorial Atlantic