New jellyfish discovered: giant venomous species found off Australia

READ MORE-WA specimen of new Irukandji jellyfish sparks particular scientific interest because it has no

An example of the Keesingia gigas jellyfish. Photograph: John Totterdell/MIRG Australia

A giant and extremely venomous jellyfish found off Western Australia’s north-west coast has researchers stumped because it appears to have no tentacles.
Keesingia gigas is one of two new species of Irukandji jellyfish recently discovered by the director of Marine Stinger Advisory Services, Lisa-ann Gershwin.
While Irukandji jellyfish are normally only the size of a fingernail, Keesingia gigas is the length of an arm and believed to cause the potentially deadly Irukandji syndrome.
The condition can cause pain, nausea, vomiting and in extreme cases, stroke and heart failure.
Gershwin said Keesingia gigas was first photographed in the 1980s, but a specimen was not captured until 2013, near Shark Bay by the marine scientist John Keesing, after whom the jellyfish is named.
Gershwin said in all of the photos the jellyfish did not appear to have tentacles and that the specimen was also captured without them.
“Jellyfish always have tentacles ... that’s how they catch their food,” she said. “The tentacles are where they concentrate their stinging cells.
“Some of the people working with it through the years actually got stung by it and experienced rather distressing Irukandji syndrome.”