Gyroptychius agassizi (Traill)
This osteolepid fish was the largest of its kind in the Sandwick Fish Bed sediments. Its almost symmetrical tail and fin position make it easy to distinguish from the other osteolepids.
Normally in the Sandwick Fish Bed this fish is found 1 in every 10 in number compared with Osteolepis. It probably preyed on everything small enough to be swallowed whole. It is found in the Sandwick Fish Bed only.