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 widespread presence across various parts of the ancient world during its time. While not as large as some of the more famous predatory sharks of later periods, Portheus represented a common and successful lineage of early sharks. The study of Portheus contributes to our understanding of the diversification and evolution of chondrichthyans, the group of fish that includes sharks, rays, and chimaeras. Its existence highlights the rich and varied marine ecosystems of the Carboniferous.