february: CROWN JELLYFISH

The crown jellyfish (also known as the cauliflower jellyfish) is a collective noun for 6 different jellyfish families. There is a lot that is yet to be discovered about this jellyfish. Other than the fact that it's edible and totally harmless to humans there isn't much information about it.

may: PACIFIC SEA NETTLE

The pacific sea nettle's latin name is Chrysaora which is a reference for a greek mythological figure, Chrysaor, the son of Poseidon and Medusa and the brother of Pegasus. He was born when Perseus decapitated Medusa. Chrysaor's name translates to "he who has a golden sword", the name probably refers to the jellyfish's painful sting.

april: COMB JELLYFISH

Unlike other types of jellyfish this species doesn't use stingers. Instead they have a big "mouth" that can open very wide and basically suck in the prey, which can be almost the same size as the jellyfish itself. They also have a tendency to eat their own conspecifics.
It's improtant to note that this is NOT an actual jellyfish, only a close relative, however they are still very cool and deserve a place here.