Gyrodus vertebra of Kimmeridgian age, approximately 152 to 157 million years ago in the late Jurassic period. These vertebrae came from the Cymodoce Zone of the Kimmeridge Clay, in Weymouth, Dorset. Gyrodus are an extinct species ray-finned fish which existed during the upper Jurassic through to early Cretaceous periods. These marine fish were durophage feeders meaning they feed on hard shelled or exoskeleton bearing organisms. These vertebra are sold individually and are 0.6 mm in diameter. They are supplied in a small plastic bag with an information label.