Ammonite research. Researcher in front of a large ammonite, holding an enlarged cast of the radula (teeth) of a fossilised Baculites specimen, used to feed on zooplankton. Baculites are a straight-shelled form of ammonite. Ammonites, now extinct, were marine invertebrate cephalopod molluscs, usually with a spiral shell. Most were less than 20 centimetres across. Ammonites first appear in the fossil record around 400 million years ago and became extinct at the end of the Cretaceous Period 65 million years ago. Photographed in 2011, in the palaeontology gallery at the French National Museum of Natural History (MNHN), Paris, France.
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