I was analysing a molluscs assemblage from a Roman villae in northern Spain when I found a strange piece. I'm sure this is not a mollusc, and I thought it might be a crustacean (crab, lobster or similar), but after a careful look I wouldn´t say it is a crustacean. In fact I would say it is probably part of a tooth or something like that. It is not a bone, there is nothing inside, it is empty. I leave you three different views of the piece. Any idea about what is this?