Larvae (?) from Red Sea

I found several of those ribbons on one particular night dive at Shaab Rumi, Sudan this March. What are they?

Hi,
dont think larvae.
Looks like a jellyfish colony.
Maybe Apolemia uvaria or a relativ.
Have this in german:
https://www.meerwasser-lexikon.de/tiere/7172_Apolemia_uvaria.htm

Regards,
Wolfgang

Hi Wolfgang,

That thing actually was quite small, around 3-5 mm in diameter and about 20-50 cm in length. Thanks, for you suggestion, but Apolemia seems to be much bigger. I shared full size image here with a bit more details.

Regards,

Alex

Hi Alex,
still looks like a colony to mee ;-))
I have zoomed in to a 100% and then you can see strings / connections like a stomach or something.
An "egg" line would not have that. And i am not sure if any kind of salt water animal is laying lines like this.
Most do balls, free floating single eggs, or maybe nudibranches with their "flower" style.

There are a lot of hydroid colony animals, i am not an expert in this direction...
Have yo tried to google "salp"?
Maybe a baby colony of that?

Regards,
Wolfgang

Hi Wolfgang,

Yes, I agree, it looks very much like a salp (juvenile probably). I searched though salps images, but never found this particular one. This is the closest I've found.

Regards,

Alex