Cailliauin

Cailliauin is a genus of extinct cartilaginous fishes that lived during the Devonian period. These ancient sharks are known primarily from fossilized teeth and scales. The name "Cailliauin" is derived from the specific geological formations where many of its fossils have been discovered.

The teeth of Cailliauin are characterized by their distinctive shape, often described as being triangular and serrated, or with a more blade-like cutting edge. This morphology suggests that Cailliauin was likely a predatory fish, capable of feeding on other marine organisms. Its exact size and appearance are not fully understood due to the fragmented nature of the fossil record, but it is believed to have been a medium-sized shark.

Fossils attributed to Cailliauin have been found in various parts of the world, indicating a relatively widespread distribution during the Devonian. The Devonian period, often referred to as the "Age of Fishes," saw a significant diversification of aquatic life, and Cailliauin represents one of the many types of cartilaginous fishes that inhabited the oceans of that era. Research into Cailliauin continues to shed light on the evolutionary history of sharks and the ancient marine ecosystems they inhabited.