@kamen088 no idea !of the name It was in Dubai. Despite the nets I found 5 or 6 of these types. But we have almost the same in Mediterranean Sea, they are not very dangerous, they burn during few hours and can let you scars sometimes....
Jellyfish in the water are pretty creatures, and look so soft and innocent, but yeah, you don't want to run in to one... I've got pictures of them on my flickr site that I took while diving.
Pretty though :)