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Cannonball Jellyfish (Stomolophus meleagris)

Also known as the cabbage head jellyfish, the cannonball jellyfish is a species of jellyfish found from the eastern seaboard of North America all the way down to Brazil, with some populations found throughout the Pacific as well. Like other jellyfish the cannonball feeds mostly on zooplankton that it dispatches with its stinging nematocysts. The Cannonball also has a symbiotic relationship with L.dubia the Longnose Spider Crab (and a few fish/crab species)which resides on the jelly and feeds on passing zooplankton and sometimes the jelly itself. Like all jellyfish the cannonball jellyfish does sting and can cause immense pain in humans,  it also has a mucus that it releases though its nematocysts as well, this mucus has a toxin that when released harms animals in the immediate area. This is used to stun prey and drive away predators and can be dangerous for humans as it can cause cardiac problems.

Phylogeny

Animalia-Cnidaria-Scyphozoa-Rhizostomae-Stomolophidae-Stomolophus-meleagris

Image Source(s)