Please help to ID!

[Gans_Ales]

Good day!

I`m a new here.

I need help identifying a small creature.

It lives inside a rock, in a crevice that it seems to be gradually widening.

From the crevice, it extends something resembling a mantle and siphon. It appears completely black (or perhaps dark purple).

If you shine a flashlight on it, it retracts inside.

 

[bikerbutter]

Good day!

I`m a new here.

I need help identifying a small creature.

It lives inside a rock, in a crevice that it seems to be gradually widening.

From the crevice, it extends something resembling a mantle and siphon. It appears completely black (or perhaps dark purple).

If you shine a flashlight on it, it retracts inside.

No idea. I wish I could help you with that but I will be following with interest to see.

 

[bluemon]

Some sort of tunicate?

 

[BristleWormHater]

Good day!

I`m a new here.

I need help identifying a small creature.

It lives inside a rock, in a crevice that it seems to be gradually widening.

From the crevice, it extends something resembling a mantle and siphon. It appears completely black (or perhaps dark purple).

If you shine a flashlight on it, it retracts inside.

I would say somekind of rock-boring clam. Some clams secrete a special enzyme to dissolve substrate and nestle themselves into the rock. Harmless/beneficial filter feeder.
@ISpeakForTheSeas

 

[ISpeakForTheSeas]

I would say somekind of rock-boring clam. Some clams secrete a special enzyme to dissolve substrate and nestle themselves into the rock. Harmless/beneficial filter feeder.
@ISpeakForTheSeas

Clam/bivalve or tunicate, it's a harmless filter-feeder, but from first impressions I am inclined to say some sort of boring bivalve as well.

OP, is the hole the critter lives in a circle, a figure-eight/barbell shape, or a straight, elongated oval?

Also, I am assuming it has two separate open holes at the end of the siphon there, correct? If so, does the other hole not shown in the pics have little "tassles" around the edges of it?