I found this bone while studying bats in the Indoesian rain forest, i came across this bone deep in a cave and have no idea what it could be so was hoping someone could help. I was guessing it was some kind of jaw bone with the teeth merged as part of the jaw. Thanks!
I agree that superficially this does resemble a lower jaw BUT there are enough features to exclude this. On the right of the second photo there appears to be a broken edge which has a very equal thichness, there does not appear to be any tooth sockets and the lower photo has some 'growth ring' type featrures. I think that this is part of a Queen Helmet shell. Do a google image search and I think you will see what I mean.