X-ray of a fossil ammonite shell, Clydoniceras

X-ray of a fossil ammonite shell, Clydoniceras

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Credit: D. ROBERTS/SCIENCE PHOTO LIBRARY

Caption: Ammonite shell. X-ray of the spiral shell of the ammonite fossil, Clydoniceras discus. Ammonites are a type of extinct cephalopod mollusc which resembled a squid-like animal within a coiled shell. Here, some external patterning on the shell is visible. The shell was many-chambered and it protected the delicate organs of the mollusc, as well as being used for buoyancy when some of the chambers were pumped full of air. Ammonites lived from the Devonian period (approximately 400 million years ago) to the end of the Cretaceous period (64 million years ago). This specimen was found at Wotton-under-Edge in Gloucestershire, England.

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Keywords: ammonite, animal, animals, clydoniceras, clydoniceras discus, fossil, fossil invertebrate, fossils, invertebrates, palaeontology, paleontology, shell, spiral form, x-ray

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