Help me identify sponge/tunnicate/thing.

[entranced]

As you can see in the following video where flow has been turned off it has some means of circulation, it throws streams of water through the openings, but can't clearly see any movement.
I thought tunnicates had two openings that clearly moved throwing water out?

22 September 2022

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[ISpeakForTheSeas]

As you can see in the following video where flow has been turned off it has some means of circulation, it throws streams of water through the openings, but can't clearly see any movement.
I thought tunnicates had two openings that clearly moved throwing water out?

22 September 2022

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Tunicates do have two openings (the oral siphon and the atrial siphon), but it can be pretty difficult to see the second opening with some species. Similarly, I imagine that the visibility of their movement likely depends on the species too.

So, while I agree that I can't see a clear second siphon in the picture (the video won't play for me - it say's the video is private), these look like tunicates to me, as that transparent/translucent color is incredibly rare in sponges but relatively common in tunicates.

All of that said, though, some white light photos of both this and various other angles may be helpful to confirm the ID/hopefully narrow down the ID further.