Pharyngolepis oblongus, primitive jawless fish Spinosaurus about the time that dinosaurs

about the time that dinosaurs began to appear

It was the most common of the giant sauropods to be found in North America

these are thought to indicate a filter feeding lifestyle

a Messel frog

Pharyngolepis oblongus, primitive jawless fish Spinosaurus about the time that dinosaursPharyngolepis is an extinct genus of primitive jawless fish that lived in the Silurian period of what is now Norway. Pharyngolepis had well developed anal and caudal fins, but no paired or dorsal fins that would have helped stabilise it in the water, and so was probably a poor swimmer, remaining close to the sea bottom. The pectoral fins were instead replaced by bony spines, possibly for protection against predators, and there was a row of spines