CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Orthocerid hunting trilobites, artwork. Orthocerids are extinct members of the Cephalopoda class of marine animals that include squids, octopuses and nautiloids. They existed from the Early Ordovician (490 million years ago) to the Late Permian (260 million years ago). Orthocerids grew a distinctive cone-shaped shell, known as an orthocone, that ranged in size from a few centimetres long to over five metres in length.
Model release not available. Property release not required.