Figure 4 in Evolution of axial patterning in elongate fishes

Figure 4. Contribution of increases in vertebral number and aspect ratio to overall body elongation. Elongation ratio (ER) is the standard length divided by the next largest body axis, either width or depth. The raw values plotted here were converted to independent contrast scores and a reduced major axis (RMA) regression, with the intercept forced through zero, was performed. A, total vertebral number vs. ER. Results from RMA regression on independent contrasts: y = 9.3x, R = 0.32, P = 0.02. B, vertebral aspect ratio (AR = centrum length/centrum width) vs. ER. Points represent the mean of abdominal and caudal ARs for each species. Results from RMA regression on independent contrasts: R = 0.18, P = 0.72. C, axial elongation index (AEI) vs. ER. AEI = (abdominal vertebral number)(abdominal AR) + (caudal vertebral number)(caudal AR). Results from RMA regression on independent contrasts: y = 10.0x, R = 0.46, P <0.001., Beloniformes;, Elopomorpha;, Ostariophysi;, Osteoglossomorpha;, Paracanthoptery-