Syracosphaera labrosa Bukry & Bramlette, 1969b
Bukry, D., Bramlette, M. N., 1969b. Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. Tulane Studies in Geology 7, 131-142.
Varol, O. 1989b. Eocene calcareous nannofossils from Sile (northwest Turkey). Revista Española de Micropaleontología 21: 273-320.
Syracosphaera labrosa
Bukry & Bramlette, 1969
Middle Eocene
Cook Mountain Formation, Columbus Landing, Louisiana, USA