Redlichia chinensis, Cambrian trilobite fossil. Trilobites were arthropods that fed as they crawled on the seabed. They lived between 500 and 300 million years ago and are now extinct. This specimen dates from the Lower Cambrian, and was found in the Muchang formation, Hua Yuen Shales, China. This specimen has a wide cephalon with a border and the glabella tapers forwards. The hypostoma has been pushed through form the underside. The genal spines are not at the occipital edge. The thorax narrows rapidly to a small pygidium and the pleurae terminate in short spines. This specimen is 7.5 centimetres long.