Eric Walker added Sleep Evolved Before Brains. Hydras Are Living Proof. and Cassiopea - Wikipedia to Upside-down jellyfish, and added Upside-down jellyfish to Cassiopeidae

Eric Walker added Upside-down jellyfish to Cassiopeidae, and added Cassiopeidae to Rhizostomeae

Eric Walker added Cassiopeidae to Rhizostomeae, and added Rhizostomeae to Scyphozoa