Tribrachiatus digitalis Aubry, 1996
Aubry, M. -P., 1996. Towards an Upper Paleocene-Lower Eocene high resolution stratigraphy based on calcarous nannofossil stratigraphy. Israel Journal of Earth Sciences. 44: 239-253
Bybell, L. & Self-Trail, J. 1997. Late Paleocene and Early Eocene calcareous nannofossils from three boreholes in an onshore-offshore transect from New Jersey to the Atlantic continental rise. Proceedings of the Ocean Drilling Program, Scientific Results. 150: 91-110.