Interesting “dragon tail” tube worm

[SeeSnek]

Found this tube worm on a goni rock I recently purchased. As you can see, it has sawtooth ridges on the tube which is something I’ve not seen before. Looks like a dragon tail.

 

[shcrimps]

if they start to spread feel free to send me one ; )
i’ll send one of my lil glowing ones

 

[shcrimps]

@ISpeakForTheSeas got any idea what these ones are?

 

[IKD]

Does it show a few antenna coming out the right side, especially during feeding?

 

[ISpeakForTheSeas]

@ISpeakForTheSeas got any idea what these ones are?

This one seems to have a calcium carbonate tube rather than a mucus and sediment tube (so its tube is hard/rigid instead of leathery/flexible) and it seems to have an operculum visible (the door/plug to its tube) in the pic, so that tells us it's a Serpulid worm.

From there, the tube shape and operculum/opercular peduncle (the "stalk" of the operculum) can theoretically tell us quite a bit, but I'm not familiar enough with Serpulid taxonomy yet for it to be of much use at the moment I'm afraid (with ~95 recognized genera in the family, it's a lot to learn about, and I currently only know useful info for about 5 specific genera). The body shape, eyes, specific body parts and certain chaetae (at the microscopic level) are all also used in the identification of specific species, and most of these aren't visible without removing the worm from the tube.

OP, if you want to try for an ID, you'd need super clear pics of the feather crown, the operculum and opercular peduncle, any eyes you can find, and any pics of the worm's body you can get (removing it from the tube would be stressful, so I wouldn't suggest it). Showing the shape of the crown and operculum would be important. This info may at least be able to get us down to a subfamily/tribe level, but there's no guarantee.