Scyphozoa are a marine class of phylum Cnidaria, aka True Jellyfish. The largest species of Scyphozoa grows to over 6 feet!
Some of these True Jellyfish are covered in stinging cells. For example the Mauve Stinger(Pelagia noctiluca), which when recently dead – can still sting!
Did you know that some Scyphozoa are carnivorous!? Okay, so you are unlikely to die from being a Jelly Fish’s Dinner. Nor will most be potent enough to kill a human.
Even still, if you panic when these water rascals surround you – you might just forget how to swim – and sink into the abyss.