Fig. 17 in The middle to late Eocene evolution of nummulitid foraminifer Heterostegina in the Western Tethys

Fig. 17. Distribution of latest Bartonian, Priabonian and Oligocene heterosteginid populations (mean values at the 95.44% confidence level) on the P–X (proloculus diameter versus number of undivided post−embryonic chambers) bivariate plot (X is on logarithmic scale).