A rare black jellyfish, also known as Black Nettle, has been sighted in southern California. According to news from News 10, the swimmers coming out of the water were seen with dark membranes sticking to their body.

It is learnt that its tendrils can grow as long as 25 feet. Although they have been captured since 1920s but they have been named recently in 1997. And, recently they were seen in Southern California. The unusual sighting could be the result of warm ocean temperatures, said Nigela Hillgarth of Birch Aquarium.

In 1989, the jellyfish was seen in San Diego but they disappeared very soon after the sightings. It has been observed that the number of the species have grown in past years. This points to the fact that there in increase in amount of organic material in oceans.

Joe Richman said that he has spotted the jellyfish while he was kayaking. "They are not likely to kill you. They are not a deadly jellyfish, but they can give you a painful sting", he said. They sting from jellyfish is not said to be fatal.

According to reports from the Orange County Register, some people have suffered stings from it all over their bodies while they were swimming at Thousand Steps Beach in south Laguna Beach.