As you might expect, Spinosaurus teeth vary in size, width, and color. For convenience we've grouped teeth into similar sizes by length and "visual weight" in order to assign then to categories:

Small - 1" to 1.75" (approximately 2.5cm to 4.5cm)

Medium - 1.75" to 2.25" (approximately 4.5cm to 5.5cm)

Large - 2.25" to 3" (approximately 5.5cm to 7.5cm)

Extra Large - 3" to 5" (approximately 7.5cm to 12.5cm)

Small and Medium Spinosaurus Teeth ship in a glass-topped riker box case measuring 4 1/2" x 3 1/2". The Large Spinosaurus Tooth ships in a 6 1/2" x 5 1/2" glass-topped riker box case. XL Spinosaurus teeth are larger than our display cases and instead ship in a sturdy packing carton. All teeth include a small information card that also serves as the certificate of authenticity.

In addition to the classic boxed specimens, we also have even larger teeth available. These massive teeth are too large for our standard riker boxes and will ship in sturdy cartons.

Extra large teeth are 3" to 5" (approximately 7.5cm to 12.5cm) and come with a small information card that also serves as the certificate of authenticity. Showcase specimens (larger than 5") are priced and sold individually, and come with individual certificates of authenticity.

Please note: ALL Spinosaurus teeth will show some sign of repair. In addition, to protect the specimen during transit every Spinosaurus tooth is individually wrapped.

On receipt, simply open the top of the case and unwrap the tooth and then arrange the tooth inside the case as pictured here on the site. We also recommend placing the bubble wrap under the soft, white lining of the case. This extra padding will keep the tooth snug in the case after the lid is secured.

"Spinosaurus appears to have been poorly adapted to bipedal terrestrial locomotion. The forward position of the center of mass within the ribcage may have enhanced balance during foot-propelled locomotion in water." ~ Nizar Ibrahim, Paleontologist, University of Chicago

As its name suggests, Spinosaurus also had elongated neural spines forming a massive dorsal sail.

In some species, the spines in the namesake sail measure more than 6ft (2m) in length, providing the framework for an impressive structure that would rise high above the water. The shape and function of this spine sail have been hotly debated topics. Some theories suggest that the sail wasn't a sail at all but a "fatty-hump". However, a detailed reconstruction in 2014 concluded that the spines were too poorly vascularized to support such a structure and the spines were likely covered by skin and used for display. The same study also suggests that its limbs were somewhat shorter than previously thought, and appear to be specifically adapted to paddle-swimming like early whales.

Explorer and fossil collector Richard Markgraf discovered the first Spinosaurus remains in 1912 near the Bahariya Oasis in Western Egypt. At the time, Markgraf was working for German paleontologist Ernst Stromer. He sent the partial remains to Stromer in Munich who announced the discovery in 1915 and named the species Spinosaurus aegyptiacus.

Then in 1944, the allied bombing of Munich destroyed Erich Stromer's entire dinosaur collection including the original, or holotype, specimen Spinosaurus aegyptiacus.

Recently, a brand new paper has turned the Spinosaurus' lifestyle on its head once more. A study of the animal's bone density shows Spinosaurus would have been quite heavy, which may have helped it submerge and hunt below the water as well. Without flippers, compacted bones may have been a solution for the species to move underwater. Not only would this be a new way of looking at Spinosaurus, but it would change our understanding of all dinosaurs, as previously underwater hunting was only within the realm of marine reptiles outside the dinosaur group, such as mosasaurs and plesiosaurs.