This Specimen has been sold.
1.4" Partial, Fossil Xenacanthid Shark Dorsal Spine - Texas
This is a 1.4" long, partial dorsal spine of a Xenacanthid shark (Xenacanthus sp.?) collected from the Early Permian, Wolfcampian Series (280 - 299 Million Years Ago) of Texas.
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.