Identificaciones de luca_dt

A seagull had pulled this worm from one of the worm beds we get along the beach. I gave it a fright and it dropped it. I had tried digging for the worms, but found nothing except for empty tubes (see 7th photo). I am assuming the worm shown is the worm species creating these worm beds. But it may not be. Any suggestions @readgb? I don't think it looks like a Thoracophelia as you thought they may be?

3mm approx.
3m depth.
temp 13 degrees.
On hydroid attached to old encrusted metal beam under wharf.
Please see @apteryx54 observation for the same species on the same hydroid on 24.5.2023.
https://inaturalist.nz/observations/163433150

3mm approx.
3m depth.
temp 13 degrees.
On hydroid attached to old encrusted metal beam under wharf.
Please see @apteryx54 observation for the same species on the same hydroid on 24.5.2023.
https://inaturalist.nz/observations/163433150

Between 2 to 3 mm.
3 m depth.
13 degrees
On old encrusted wooden wharf pylon lying on the sandy substrate under the wharf.
There were at least 10 + on these hydroids growing on the clump of sea tulips.
These were further down a few metres from the first hydroids that we saw the first Eubranchus sp. on. The Doto were laying eggs and all the ones I saw had the brown speckling markings on them as per @apteryx54 observation on 23.5.2023.
https://inaturalist.nz/observations/163248687
I didn't get as good as photos as Richard there was a current and were hydroids in the way but still am posting observation for recording.
There are two in the last photo laying eggs, one on each frond the back one is upside down.

3 to 4 mm
3 m depth
13 degrees
This is the second one we saw.
This was on the same hydroids as all the Doto sp. we saw that were growing on the Sea tulips a few metres from the first Eubranchus we saw.
Both the Eubranchus sp. today were the same species as seen in @apetryx54 observation
https://inaturalist.nz/observations/163433150