Rare underwater sightings in Pacific

Rare jellyfish
The Chirodectes Jellyfish (Scuba Ventures Kavieng)

Two rare, large tentacled sea creatures have been captured on video recently – one at scuba-diving depth off Kavieng, Papua New Guinea and the other in the deep Pacific Ocean out from Hawaii.

Also read: Deep octopus nurseries on ‘edge of human imagination’

The first, a jellyfish with distinctive ring and spot markings and four groups of striped tentacles, was spotted by a scuba diver who posted the video footage on Scuba Ventures Kavieng’s Facebook page. “It has cool markings and is a bit bigger than a soccer ball,” stated the diver, adding that the jellyfish swam “quite fast”.

It is thought by experts that the animal could be Chirodectes maculatus, a type of box jellyfish only ever recorded once before but never seen live or captured on video until now. It was described in 2005 by scientists from a preserved specimen caught in Australian waters, but that jelly had solid spots rather than rings so could be a different species.

Rare jellyfish
Close-up showing the jellyfish’s unusual markings (Scuba Ventures Kavieng)
rare seapen
Deep seapen on its long, slender stalk (Ocean Exploration Trust / NOAA)

Meanwhile the deep-sea sighting was of two Solumbellula monocephalus seapens, although only one was caught on camera. They were spotted just short of 3km deep by Ocean Exploration Trust researchers diving the ROV Hercules from the research vessel Nautilus

They had been investigating deep-sea coral and sponge habitats on a previously unsurveyed seamount north of Johnston Atoll when the sight of the colonial cnidarians caused excitement.

The seapens were reckoned to be as big or bigger than the ROV. The one on video can be seen to have a single large feeding polyp and barbed tentacles stretching more than 40cm from its 2m long stalk to sting and catch its prey. 

Rare seapen close-up
Close-up showing the seapen’s barbed tentacles (Ocean Exploration Trust / NOAA)

“My mind is blown right now,” one of the scientists can be heard saying because the species, the only one described in its genus, had only ever been seen in the Atlantic and Indian Oceans before. The team now hope to determine from the footage whether it was a Pacific Solumbellula or a new species. 

Johnston Atoll lies between Hawaii, the Line Islands and Kiribati, and is designated as a protected area within the Pacific Remote Island Marine National Monument. The expedition is funded by NOAA Ocean Exploration via the Ocean Exploration Co-operative Institute.

Also on Divernet: Rare Ghost Shark Surprises Divers, Diver Discovery Doubles Numbers Of Rare Walking Fish, Rare Megamouth Shark Recorded, Jelly King Of The Deep: Rare Snailfish Captured


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