ID please. Is this a clam?

[robbo3542]

Greetings,
I am asking to help me ID something that I think might be a clam.
It looks like it is attached to the rock on one side and I see only shell on top. It kind of moves up for about 2-3mm. It hides (closes) when touched (this is how I noticed it is not a rock, it must be something alive). I thought clams have 2 shells. This one seems to have only one. It is around 2.5 cm (1inch).

Thank you in advance for all responses.

 

[Tahoe61]

I am going for cool Limpet.

 

[BryanM]

Not sure, following

 

[minus9]

I have lots of bivalves that live in my Aussie/Solomon Island rock, very cool.

 

[Üter]

Greetings,
I am asking to help me ID something that I think might be a clam.
It looks like it is attached to the rock on one side and I see only shell on top. It kind of moves up for about 2-3mm. It hides (closes) when touched (this is how I noticed it is not a rock, it must be something alive). I thought clams have 2 shells. This one seems to have only one. It is around 2.5 cm (1inch).

Thank you in advance for all responses.

limpet

 

[dwest]

I’m going with limpet or chiton.

 

[OrionN]

Not a bivalve. To actually ID it we need better pictures.