Fig 4. Comparison of morphotype assignment methods.

Principal coordinates analyses (PCoA) of corallite morphology across six sites in the Gulf of Mexico, with color overlays corresponding to morphotypes. Morphotype assignments were made using a k-means cluster test (left; kRCLUSTER: R = 0.746) and by the threshold in corallite spacing measurements at 8.40 mm (right). Assignments using the corallite spacing method had a correct assignment rate of 93.87% when compared to assignments from the k-means clustering method (13 incorrect out of 212 assignments, shown in gray).