Fig. 1

H. vulgaris body plan and cladograms. (a) Diagram depicting the H. vulgaris body plan which consists of the hypostome, tentacles, body column and foot. The H. vulgaris body is made up of two epithelial layers, the endoderm (light orange) and the ectoderm (bright pink). (b) Animal cladogram adopted from [13]. (c) Cnidaria cladogram inferred from [14, 15] to include only the species we used in this study, this is not a complete tree