Shell was slightly open and could see a glistening, wet gooey-looking interior and I wish I had taken a picture before touching it. Shell closed tight when I touched it.
Just a lobster? The last bit of the tail didn't fan out, it was just that one triangular point.
Velutinidé lors d'un relevé de pétoncle par MPO-Québec / Velutinid observed during a scallop survey by DFO-Quebec.