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An ammonite's last supper

X-ray image of fossil reveals diet of ancient marine animal

The final meal of an ammonite, one of those extinct marine creatures that feature so prominently at fossil shows, has been revealed by a three-dimensional X-ray analysis of a specimen from South Dakota. The pointy yellow things are the ammonite’s teeth, stripped off a structure called a radula that acts like a tongue to get prey into the animal’s mouth. The teal-colored blob at lower right is the remains of a small shrimplike crustacean, while the purple thing at upper left is a fragment of a larval gastropod.

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