1.9" Partial, Fossil Xenacanthid Shark Dorsal Spine - Texas

This is a 1.9" long, partial dorsal spine of a Xenacanthid shark (Xenacanthus sp.?) collected from the Early Permian, Wolfcampian Series (280 - 299 Million Years Ago) of Texas.

There is a repaired crack through this specimen.

Xenacanthus is a genus of extinct freshwater shark that lived between the Devonian and Triassic periods. Their distinguishing features include v shaped teeth, a ribbon-like dorsal fin and a large spine that protruded from the back of their head. It has been speculated that the spine had venomous properties, similar to that of a stingray spine. Fossil records indicate that their maximum length was around 4 feet. Due to the shark being primarily cartilage, most fossils of this shark are isolated teeth and spines, however some locations feature soft body preservation.
Xenacanthus sp.?
1.9" longest measurment
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