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Calvo and Salgado 1996
The cow sharks are considered the most primitive ones because they preserve a skeleton anatomy very similar to the ancient and first types of sharks
Heptranchias
Marty et al
88185 - Top Beautiful Red 1.71 Inch Spinosaurus Dinosaur Tooth Cretaceous Dinosaur Calvo and Salgado 1996Spectacular example of tooth belonging to an individual of Spinosaurus. The enamel color is spectacular, featuring intense and brilliant orange tones. Not restored or glued. One of the difficult features to find in dentition samples of Spinosaurus is present in this piece. It is the preservation of the root (the part of the tooth without enamel, which occupied a lower position in the gum). Its preservation is complicated due to the hollow structure,
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