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They belong to an extinct class of the phylum Arthropoda
Footprints are trace fossils
Order: Lithornithiformes
Its pair of pectoral fins were armored as well
It has been suggested that Spinosaurus ate fish because of it's crocodile-shaped skull
Tyrannosaurus rex, (Baby-Hatchling Tooth) Argentinosaurus They belong to an extinctT rex baby teeth are very rare and you can own one for your collection as a replica. The original tooth was found in Late Cretaceous, Hell Creek Formation of South Dakota. Comes with the base as shown. Note that even though this T rex was a hatchling its teeth were still serrated as seen in the last photo on this page. Shipping Included