Crassigyrinus was a labyrinthodont that lived in the Carboniferous period, in the rivers of Scotland, 345.3 to 328.3 million years ago (Visean Stage and early Serpukhovian Stage)
It was carnivore, so, it probably ate fish and insects like Meganeura or arthropods like Giant Scorpions. It had two rows of teeth and was over 2 metres long. It is thought to have been an ambush predator, using bursts of speed from beneath the water to catch prey.
Prehistoric Park[]
One Crassigyrinus was seen in the fifth episode of Prehistoric Park, but Nigel did not bring him to the Park. It bit Nigel on his leg and fled, but when the explorer returned to the river, he caught the labyrinthodont and showed some points of interest of it to the camera. He later releases it which it then swims away.