Round trap door with tentacles

[Darkrooster]

Anyone recognize this guy. He has a round trap door and when he opens it 4 tentacles come out. He is in my symphillia skeleton. He’s been there over 2 years. Doesn’t seem to hurt the coral at all. Any ideas?

 

[KrisReef]

Kind of looks like a Stomatella snail. They usually don't hang out in one spot?

 

[Darkrooster]

This guy is buried in the skeleton not on top. Antenna is probably a better word the tentacle. It has two long and two short ones and snaps the lid back down when startled.
Green circle is the closing door red is antenna. Blue circle is face. I will try to crop video closer

 

[Darkrooster]

Doesn’t move at all been there 2 plus years

 

[littlefoxx]

@ISpeakForTheSeas

 

[Sophie"s mom]

You need @ISpeakForTheSeas ! They may know

 

[ISpeakForTheSeas]

Anyone recognize this guy. He has a round trap door and when he opens it 4 tentacles come out. He is in my symphillia skeleton. He’s been there over 2 years. Doesn’t seem to hurt the coral at all. Any ideas?

Seems to be a large Vermetid snail of some kind - the large ones don't seem to cause issues like the small ones from what I've seen, so I'd personally keep it.

It has two long and two short ones and snaps the lid back down when startled.

The lid is the operculum; I'm not super familiar with vermetid genera yet, but I know the Thylacodes genus has multiple species with the two long and two short tentacles (two cephalic tentacles- the long ones - and two pedal tentacles), so a Thylacodes species may be a good guess.

Figure 1 in the link below shows some illustrations of different vermetid species, including two Thylacodes species to show the different tentacles; both "c" and "d" in the figure are actually Thylacodes species despite their labeling:

https://scholarspace.manoa.hawaii.edu/server/api/core/bitstreams/81383294-0086-456b-a6b6-3ba34ea6ad01/content