Fig. 7

Plot of “mean of means” values for Li + li and E values for commonly accepted Orbitoides species (blue points, forming an evolutionary sequence) and informal/new taxa which appear to show “retrograde” embryonic evolutionary features (red points). Blue and red rectangular envelopes describe the max and min range values for these mean parameters. Data used is a compilation of that from Caus et al. (1996), Mitchell (2005) and this paper. The approximate relative positions of other commonly accepted species (O. sanctaepelagiae and O. gensacicus) are shown on this evolutionary line, although no data were available for these taxa from the quoted sources