Fig. 8
From: Adoption of conserved developmental genes in development and origin of the medusa body plan
Prevailing view compared to new interpretation of the medusa body plan. a Prevailing view of polyp-medusa body plans: the medusa subumbrella corresponds to the hypostomal field of the polyp, and hence, the medusa represents a polyp with extremely shortened oral-aboral axis and an enlarged hypostome (red, corresponding colours). Upper row modified after [22]. b Proposed new model: the medusa bell is largely the product of fused tentacle anlagen