rhizostomae

Today the weather here in Scotland was better than yesterday, so my boyfriend and I took the chance to spend it at the beach on the west coast. As the high tide started retreating in the afternoon, two massive Rizhostoma pulmo, the barrell jellyfish, sadly got stranded ashore, they were the biggest I have ever seen!

Take my footprint as a reference, it’s about 27 cm, or about 10.5 in. This is the largest jellyfish species in British waters, but it is more commonly found in the Mediterranean, Black Sea, Sea of Azov and is also present in the Southern Atlantic, around South Africa.

On average they measure about 40 cm (16 in) in diameter, but I roughly estimated these two to be both above 50 cm (c. 20 in). They were big, but they can reach almost double this size!

They possess eight short and fleshy tentacles, but they are unable to cause any harm to humans as they feed on plankton, which they strain using the orange frills you see in photo, so they don’t need the urticating toxins found in other species. 

The second one was still moving, I tried my best but couldn’t pull it back to the water…it was slippery, and so much heavier than you might think!

Among the jellyfish, the queen by fragolina160 Lung of the sea (Rhizostoma pulmo), It is the largest jellyfish in the Mediterranean and is the favorite food of the sea turtles. Unfortunately the plastic bags look much like jellyfish and they are getting more and more often ingested by these.
Less plastic = more marine life!

This gif, captured by Stewart Whitfield, shows the water off Thailand’s coast and you can probably hazard a guess as to what’s happening here. Baby fish (juvenile shrimp scad, aka slender yellowtail kingfish) are hiding under the bell of a jellyfish, using its stinging threads as protection from circling predators, namely a trumpet fish nearby.

But the jelly’s billowing structures aren’t what they seem.

Keep reading

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Australian Spotted Jellyfish (Phyllorhiza punctata)

Also known as the Floating Bell or the White-spotted Jellyfish, the Australian Spotted Jellyfish is a species of Mastigiid jellyfish that occurs in the West Pacific from Australia to Japan. However, it has been introduced elsewhere. Like other jellyfish P. punctata is a predator and feeds mainly on zooplankton. 

Classification

Animalia-Cnidaria-Scyphozoa-Rhizostomae-Mastigiidae-Phyllorhiza-P. punctata

Images: Nick Hobgood and Orest

Root Mouthed Jellyfish (Eupilema inexpectata)

…a species of Rhizostomatid jellyfish that is the only member of the genus Eupilema. Root mouthed jellyfish occur along the entirety of the South African coast, and inhabit waters from the surface to around 35m (114 ft) underwater. Like most other jellyfish Eupilema inexpectata is a predator and will feed on a myriad of microscopic prey.

Classification

Animalia-Cnidaria-Scyphozoa-Rhizostomae-Rhizostomatidae-Eupilema-E. inexpectata

Image: Peter Southwood