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The Lions Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago) and are among some of the oldest surviving species in the world. The largest can come in at about 6 meters and has tentacles over 50 meters long.

Real or Fake?
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Holy crap that is awesome. I would be afraid to get that close to its tentacles.
So Cool. Thank you from a Biologist.
What does it eat to stay alive ? If the picture is not fake the creature needs a lot of energy to stay alive, at least this is my logical conclusion...
magic..i like it.hope i will reach there soon...:)
there is a Sherlock Holmes story about the Lion's Mane. Mysterious death, body covered in a web of red welts, Sherlock called for. Turns out to be a Lion's Mane jellyfish. Set in Cornwall so I don't the likelihood of it actually happening :)
that would be awesome unless I actually came across one.
why do people fake these things? as if the real jellyfish wasn't awe-inspiring enough
what are you doing trying to kill yourself
Is it poisonous? That thing can easylly swallow the scuba.
if its not fake, then it would be great photoshop augmentation
Somehow the name jellyfish doesn't quite cut it anymore...
This is scary stuff. I may see this in my dreams tonight.
i thought jelly's of that size where only in sponge bob O.o
That's crazy, how have we never seen this before? Unless it's 100% fake.
wowww.. awesome.!
it can be jellyfish fried.. ^^
so scary ...but its look like mushrom :)
sooo, it's a fake picture, but did you just make the rest of the information up?
The largest recorded specimen found, washed up on the shore of Massachusetts Bay in 1870, had a bell (body) with a diameter of 7 feet 6 inches (2.29 m) and tentacles 120 feet (37 m) long.[1]
Wow --I have never seen a jellyfish that huge before..awesome
brace yourselves, tentacruel(pokemon) is COMING!!
I would kill it with fire!
how is that for a perspective! mind blowing....
I object to this article showing me this, then failing to convey the really important information - how much piss on my leg would it take to counter the effects of the sting?
woah!!!! a whole new meaning to MASSIVE!!!
That's what I imagine a polyp on Godzilla would look like
If a post sounds extraordinary, and some people plant doubts about it being photoshopped etc, I am lost. I would welcome some kind of feature here that enables seeking validation, through which acknowledged subject matter experts will validate the post.
This is super fake and photoshopped.C'mon people!
WOW, I did not know this species of jelly fish existed. It's enormous. What does it feed on?
I had no idea anything like that existed. Simply amazing.
YIKES!!! That is one huge jelly fish! I had no earthly idea they came in that size!!!
It's really hard to believe that this thing is real, I'll like to find more info about this specie, I think is phenomenal.
Never seen such a thing before.!!!!! Thanks for the information
Absolutely amazing. What does a Jellyfish think about, down there in the cold, dark sea?
looks like what my Julie eats to get hi, mushroom
amazing!!! encourages me for scuba diving.
After reading the comments, I realise it is likely a doctored picture....but none-the-less, my first instict was to kill it...with fire if possible.

That would make SPONGE BOB & PATRIC... really happy !!!
it almost looks like the "Brain bug" in starship troopers with a jellyfish costume... :DDD
NOT true, photoshopped. Largest ever found was just over 7ft diameter.
agree Eric plus no diver in their right mind would swim in the tentacle stream down stream of the jelly
I actually thought this picture is fake. Incredible and creepy as hell
It is fake. If people keep on spreading fake things telling they are real, how can you guarantee the integrity of the information in the web? Imagine a teacher showing this to his class... It would be pathetic...
Wow! Thanks for sharing this....
boo Jay
I just wet my pants....
lol... how the hell did we miss this all along?
Zora S
That scuba diver is brave. When I see stuff like that it blows my mind.
HOLY CRAP! If that thing stings you....
What an interesting post! I shared this but unfortunately it caused an uproar by +Jared DeMarzo who accused me of spreading inaccuracies on G+ and later demanded that I delete my post.
Zora S
Jeeshh. No, I don't think it is Photoshop...
that is sssssssssssssssssssssooooooooooooooooooooooooooooooo cool and amazinly awesome
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