Pleurotomaria redcarensis gastropod mollusc collected from Jurassic Lower Lias deposits in Redcar, Cleveland. Pleurotomaria is an extinct genus of gastropod which belongs to the family Pleurotomariidae; one of the oldest families of gastropod, first appearing in the Cambrian. Modern species live in deep waters, 2000 - 3000 m depth on the sea floor feeding on sponges and octocorals; information like this helps us establish the mode of life for these ancient fossil examples. This specimen is in good condition and measures approximately 3 cm in shell diameter. It exhibits the characteristic trochoidal shape and is supplied in a small plastic bag with an information label.