Hydroids?

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P500

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Could someone please confirm if those are hydroids? Thanks!
PXL_20230930_153238878.jpg
 
These aren’t really hydroids though. They are coronate polyps from the class Scyphozoa. This is the polyp form of some type of true jellyfish. Yours is unique and not the ones we often see in the hobby (nausithoidae and linuche).

A lot of times in the reef hobby anything with a stinging-cell that falls under they phylum cnidarian that we can identify as corals or anemones are immediately labled Hydrozoans (hydroids). If there’s a bunch together, they’ll call it “colonial”!

Just google “Syphozoa polyps” and see if you can find one that looks like yours! If they’re still there, I’d love to see what they look like now.

Here are also a couple recourses you might find interesting.

*Disclaimer* I am not a Cnidaria expert. These are just my thoughts and opinions based on my own personal experiences and research. Opinions are subjective and can be changed!

https://www.reef2rainforest.com/2013/07/19/jellies/

https://onlinelibrary.wiley.com/doi/full/10.1111/brv.12393
 

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