Pyrocyclus inversus Hay & Towe, 1962a
Hay, W. W., Towe, K. M., 1962a. Electron microscope examination of some coccoliths from Donzacq (France). Eclogae Geologicae Helvetiae 55, 497-517.
Pyrocyclus inversus
Hay & Towe, 1962
Early Eocene
Tuilerie de Donzacq, Landes, France