The Nile mosasaur is piscivorous aquatic lizard that today seems to be restricted to the river Nile. Nile mosasaurs can reach the length of 4.5 meters, though such venerable individuals are rarely seen, and 2-3 meter long mosasaurs are more common. Though at first the nile mosasaur seems to resemble the serpentine long-bodied mosasaurs, it has many characters in common with the now-extinct acenstral saurocetids. This similarity makes the classification of this animal rather tricky. Based on the patchy fossil record, genus Apep seems to date back at least to the Oligocene and has barely changed at all after it first appeared.