Portheus
Portheus is a genus of extinct cartilaginous fish that lived during the Carboniferous period. These ancient sharks are known primarily from fossilized teeth and fin spines, which are often found in marine sedimentary rocks. The teeth of Portheus are typically small, conical, and sharp, suggesting a diet of small invertebrates or fish. The fin spines were likely used for defense and possibly for steering or stability while swimming.
Fossil evidence indicates that Portheus inhabited shallow, warm seas. The distribution of Portheus fossils suggests a