Can someone tell me if a paracite caused this?

[KEstep]

A friend of mine bought a crocea clam from a lfs and when I looked at it I found this giant hole in the shell. Has anyone seen this, could it just be where it was growing on a rock on the reef it was harvested from? Thanks for any help.

The clam appears to be doing very well. But would just like to know in case.

 

[SeanT]

Looks like it was just ripped from the rock.
It may or may not heal.