NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Trinucleus, trilobite fossil. Trilobites were arthropods that fed as they crawled on the seabed. They are now extinct. They had a carapace, or shell, that was divided into three parts. This trinucleid trilobite reached lengths of 3 centimetres. This specimen is from Ordovician rocks in Builth, Wales. It is part of the collections held at the Natural History Museum, London, UK.
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