A display specimen of an Osteolepis macrolepidotus positive and negative from the Caithness, Scotland. This sample was found in old red sandstone, and has been dated to the Devonian period. Osteolepis is an extinct genus of lobe-finned fish that lived during the Devonian period. Osteolepis' body was covered in heavy rhomboid scales, the scales on the fish's head were covered in a thin layer of cosmine a somewhat spongy bony material containing canals to sensory organs. This is believed to have allowed the fish to sense changes in water pressure. The pieces including their matrix measure roughly 15.5 x 8.7 x 2.3 cm and 15.6 x 10.8 x 2.8 cm, together they weigh around 1.751 kg. The fossil itself measures roughly 12.9 x 3.2 cm. This specimen is supplied with an information card and would make a wonderful addition to any serious fossil collection.