They belong to a group called Medusozoa which is divided into four classes: Hydrozoa, Scyphozoa, Cubozoa and Staurozoa. Comb jellies are also sometimes included in the broad sea jellies category. But ...

Although sometimes marketed as plants that don’t require water or sunlight, air ferns are actually the dyed skeletonized ...

It turns out the mysterious creature was a siphonophore, a marine organism that falls under the class of hydrozoa ... the life of one of these colonial animals that is usually outside the realm ...