The origin of Cnidaria—coral and jellyfish—is still unsolved in the basal metazoan phylogeny. Here, a Cambrian fossil of a stem-group cnidarian,Cambroctoconus orientalisgen. et sp. nov., is found to bear octoradial symmetry, but no jelly-like mesenchyme, suggesting this evolved after octoradial symmetry.
- Tae-yoon Park
- Jusun Woo
- Duck K. Choi
