Spinosaurus: "Spined Lizard."  Presently believed to be the largest carnivorous dinosaur known, an adult Spinosaur had a 5.7 foot long crocodile like skull full of conical teeth on a body measuring 50 to 60 feet in length.  The weight of this massive theropod is variously estimated to range from 7.5 to 9 tons.  Spinosaur outweighed Tyrannosaurus rex by two tons!
Spinosaur was a predator of Cretaceous coastal mangrove swamps that was biased toward fishing but scavenged anything he could take including pterosaurs and other small to medium sized animals.  Spinosaur sported a large sail on its back.  The purpose of the sail is not known but could have served as a temperature regulator or sexual display (or both). Spinosaur lived during the Cretaceous Albian Age and into the early Cenomanian Age about 100 million years ago.
Two species have been named:  Spinosaurus aegyptiacus and Spinosaurus marocannus.  These are probably the same species and should be considered synonyms.  The species name aeqyptiacus has priority as it was first named in 1915 from a specimen found at Bahariya Oasis in Egypt.  The teeth presented here for sale are from near Taouz, Kem Kem Basin, Morocco.