Figure 6
From: Evolutionary tradeoffs, Pareto optimality and the morphology of ammonite shells
Size is enriched at some of the archetypes. Ammonoid shell diameter as a function of distance from each archetype shows that small diameters are prevalent near archetypes 4 and 5. Data includes diameter for 392 genera (green points) [29], divided into 10 bins with equal number of genera according to the distance from each archetype. Average diameter for each bin is plotted (blue points). For convenience, a fit of the averages to a line is shown. (A) No diameter enrichment near archetype 1 (p = 0.29). (B) Positive diameter enrichment near archetype 2 (p <10-4) (C) Positive diameter enrichment near archetype 3 (p = 0.0007). (D) Negative diameter enrichment near archetype 4 (p <10-4) (E) Negative diameter enrichment near archetype 5 (p = 0.0002).