Fig. 9.

Multivariate regressions of size-corrected shape dimensions on size. Significant positive evolutionary allometry was detected between the size of polyps (diameter) and the cross-sectional area of the marginal musculature [r² = 0.093, p < 0.049] (a), and the marginal musculature (cross-sectional area) and the number of muscle attachment sites [r² = 0.286, p < 0.001] (b), length of the mesogleal base [r² = 0.587, p < 0.001] (c), width of the mesogleal base [r² = 0.363, p < 0.001] (d), and width of the attachment sites [r² = 0.296, p < 0.001] (e)