Curious what this worm is?

Tub Life

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Saw this on the glass, lights were off. It looked like a thin grey earthworm.

Scooped it out and not quite sure what it is. Doesn't look like the bristleworms I've dealt with iver the past decades.

1000029665.jpg
 

ISpeakForTheSeas

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Saw this on the glass, lights were off. It looked like a thin grey earthworm.

Scooped it out and not quite sure what it is. Doesn't look like the bristleworms I've dealt with iver the past decades.

1000029665.jpg
This one's probably not a keeper - it's either an Oenonid worm or a Lumbrinerid worm.

For Oenonid worms:
these worms tend to feed on mollusks (bivalves - clams, oysters, mussels, etc. - and snails)
For Lumbrinerid worms:
To quote about their diet:
"most lumbrinerids are carnivores on both sessile and motile prey, with a few herbivorous and subsurface deposit-feeding exceptions"*

The carnivorous ones tend to eat things like bivalves, snails, other worms, brittle starfish, and occasionally Heart Urchins (Spatangoida). The herbivorous ones feed on diatoms, sea grass, etc.

*Source:
Diet of Worms Emended: An Update of Polychaete Feeding Guilds - Appendix A - Family-by-Family Review
(The paper)
https://www.annualreviews.org/content/journals/10.1146/annurev-marine-010814-020007 (The link you can download the Appendix from)

For your specific worm:
I don't see a peristomial notch or any eyespots on the ventral (underside) of the head, so the other thing I can think to ask is: does it have three little tentacles tucked up under the ring of flesh right behind its four eyes on the top of its head?

If so, I expect microscope pics of the bristles would reveal both normal bristles as well as hooded hooks, and that would mean this worm is Oenone fulgida.
 
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Tub Life

Tub Life

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This one's probably not a keeper - it's either an Oenonid worm or a Lumbrinerid worm.

For Oenonid worms:

For Lumbrinerid worms:


For your specific worm:
I don't see a peristomial notch or any eyespots on the ventral (underside) of the head, so the other thing I can think to ask is: does it have three little tentacles tucked up under the ring of flesh right behind its four eyes on the top of its head?

If so, I expect microscope pics of the bristles would reveal both normal bristles as well as hooded hooks, and that would mean this worm is Oenone fulgida.
I did not see any tentacles near its head.
My Ritteri ate the worm for a snack.

Thank you for sharing your wealth of information!
 

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