LORIAN LEONHARD, a London violin dealer, keeps a large fossilised ammonite in his showroom.
That a shark with teeth like this would try to make a meal of an ammonite is, at first sight, odd.
That is why the recent discovery of a Jurassic ammonite with a shark's tooth embedded in its shell has excited palaeontologists.
Only two of 15 ammonite families survived this second extinction, says Dr Bucher, but within a million years those two had speciated into 15, and ammonites had regained their former diversity.
On top of that, coprolites, as palaeontologists politely describe fossil faeces, have turned up with ammonite shells in them.
Some ammonite fossils have tooth marks that look as though they were made by huge reptilian predators called mosasaurs.
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