Fig. 8

Mean radius of the osculating circle in the lower keel region (R _lo, in μm) for G. menardii (a), G. limbata (b), and G. multicamerata (c) through time (in Ma) at Hole 925B. See Fig. 4 for explanation of parameters. In a–c horizontal bars are quartile ranges while in d they represent ±95 % confidence intervals around the means. For explanation of symbols see Fig. 5. Please note the reduced scale on the horizontal axis in comparison to the radii of upper osculating circles in Fig. 6. Data and statistics can be read from Tables 4a–c and 5a–c in the electronic supplementary materials