Teacake's picture


Observed: 3rd July 2009 By: Teacake
jelly 1
Species interactions

No interactions present.


Rose's picture

Common jellyfish

It is a bit tricky making an identification form this photograph, as I can't see the top. But it is more than likely to be a common jellyfish. They can be up to 40 cm across. Easily recognised by the four circular violet reproductive organs on the main ‘bell' section. It feeds on small planktonic animals, which it catches by means of the stinging cells on the lips surrounding the mouth. It is often washed up on the shore.


Teacake's picture

That one was at least a foot

That one was at least a foot in diameter, but there were also a lot of small ones on the beach with pinkish purplish parts, like this: http://www.ispot.org.uk/sites/default/files/images/jelly2.preview.jpg

Rose's picture

They look like common

It looks like common jellyfish in that picture that you have put a link for in your last message. But I can't find any records of them reaching a foot in diameter.
Have a look on this website

I will email someone who may be able to help.



trudy-russell's picture

Moon Jelly

Hi, Moon(common) Jellyfish can grow up to 40cm (1 ft 4in) in diameter so it is quite possible that this is the correct ID, they are the most common jellies with purple colouration found in th UK. With dead jellies they are hard to identify, a photo of the other side might help but make sure you are wearing gloves.


Trudy Russell
Marine Advisor
Natural England

To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409

Rose's picture


Thanks Trudy for taking a look at this.


bobthebirder's picture


The 8 thick arms and smooth edge to the bell make me think this might be the octopus jellyfish Rhizostoma octopus. Some years these are really common where I live on the Dorset coast, but not recently.

Bob Ford

Rose's picture

Rhizostoma octopus?

Hi Teacake,

Looking at Bob's identification of Rhizostoma octopus it could well be this.

Have a look at this link and let us know what you think.


We should be able to get to the bottom of this identification quandary soon!


Rose's picture

Jellyfish survey

Jellyfish survey and download a "Identify your jellyfish using the free MCS jellyfish ID Guide"


Blewit Boy's picture

I would agree with...........

I would agree with bobthebirder. This is Rhizostoma octopus, rather than Aurelia aurita.


ChrisMcA's picture

The 2nd picture is definitely

The 2nd picture is definitely a moon jellyfish, you can still see the 4 rings; these seem to be pink to start with & turn blue/purple later. The 1st probably as well.Have to agree with bobthebirder, the moon jellyfish only has 4 arms but the 1st has 8