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what's this thing that washed up on the beach?


Neon

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Hi,

I've just got back from doing the Abel Tasman tramp.... it was very cool.

We found these weird jelly things on the beach and I was wondering if anyone knows what they are. I saw similar things on the beach and in the water at Christmas time. This one is a bit different as you could see the creature inside.

2010AbelTasman054-1.jpg?t=1269292935

Here's a closeup:

2010AbelTasman053-1.jpg?t=1269293626

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Going back to my marine biology/zoology days in uni here, but I dare say that is not entirely a jellyfish. Jellyfish are cnidarians, there are two forms, the characteristic medusa with tentacles and the imobile polyps - in other words they don't have eyes like that creature does. :o

Looks to me like a crustacean inside a jellyfish house, perhaps a jelly hermit crab (if such things exist)?

Who knows though, NZ has some amazing creatures, that's for sure.

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bispider and jennifer are right, its not just a jellyfish.

It looks like a comb jelly that was harbouring some sort of crustacean larva (typically they molt at least 3 times). You can see the antenae and leg segments as well as compound eyes (aka image forming)...unlike the eyes that some jellyfish have which are simple (can only see light and dark). I would guess it is a very young crab which crawled into the jelly, probably after it had already died and settled on the bottom. Jelly fish can go quite rigid after they die, as opposed to something like a salp that just turns into snot!

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"This is a small crustacean from the Phronima family. Its looks supposedly inspired movie makers when they created alien species. This phronima lives inside a salpe which is a separate species group and looks like a transparent little barrel. The phronima lives inside the salpe, eats its content until only the outer shell is left and spawns in it." (Institute of Marine Research, Norway)

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"This is a small crustacean from the Phronima family. Its looks supposedly inspired movie makers when they created alien species. This phronima lives inside a salpe which is a separate species group and looks like a transparent little barrel. The phronima lives inside the salpe, eats its content until only the outer shell is left and spawns in it." (Institute of Marine Research, Norway)

Thanks nzcookie :-) That's good to know what it is. I googled it but couldn't find the answer - hard to know when you don't know what you're looking for :wink:

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