В світі виявили новий вид гідроїдів що нагадують медуз

There are a lot of different species of Hydroid in the world, which are not flowers but rather an animal that are closely related to jellyfish, and this particular individual stood out from the rest.
Probably a species of Corymorpha. If you see closely, you can spot developing medusae between the two tentacle rows. Some of them are even pulsing .

National Geographic