Ammonite aptychi

[N.Monks@xxxxxxxxx (Neale Monks)]

Dear All,

What are ammonite aptychi for...are they opercula or are they mouthparts?

I have yet to be convinced either way.

Thanks,

Neale Monks

Neale Monks, Department of Palaeontology,
Natural History Museum, London, SW7 5BD
Internet: N.Monks@nhm.ac.uk
Telephone: 0171-938-9007

"The first ten million years were the worst. And the second ten million.
They were the worst too. The third ten million I didn't enjoy at all. After
that I went into a bit of  decline"