Trilobite fossil

Trilobite fossil

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This image is part of the feature Burgess Shale Centenary

Credit: SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY

Caption: Trilobite fossil. Fossilised Asaphus kowalewskii trilobite. The Asaphus group lived throughout the Lower and Middle Ordovician periods (around 505- 458 million years ago). The trilobites are an extinct group of marine arthropods with a hard, segmented shell that is divided into 3 sections. Most, like A. kowaleskii, were bottom dwellers, feeding on and living in organic sediment on the ocean floor. This animal had well-developed eyes which protruded out of the sediment on long stalks. Found in St Petersburg, Russia.

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Keywords: ancient, animal, animals, arthropodan, asaphus kowalewskii, bottom dweller, cambrian, extinct, eyes, fossil, fossil invertebrate, fossilised, fossils, geology, invertebrate, invertebrates, marine, middle, old, palaeontology, paleontology, petersburg, preserved, protruding, rock, russian, saint, segmented, segments, shell, single, solitary, st, stalks, stone, trilobite, zoology

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