Leedsichthys

Extinct genus of fishes

Leedsichthys is an extinct genus of pachycormid fish that lived in the oceans of the Middle to Late Jurassic. It was the largest ray-finned fish, and amongst the largest fish known to have ever existed. The first remains of Leedsichthys were identified in the nineteenth century.

From Wikipedia, under CC BY-SA. More on occurri.