Sinusiidae
Sinusiidae is a family of extinct ammonoids, a diverse group of cephalopods that lived in the ancient oceans. These marine invertebrates are characterized by their coiled shells, which served as protection and a buoyancy mechanism. The family Sinusiidae is distinguished by specific features of its shell coiling and suture patterns, which are the lines where the internal walls of the shell meet the outer wall. These features are crucial for classifying and differentiating fossil ammonoids.
Fossils of Sinusiidae are found in marine sedimentary rocks dating primarily to the Jurassic period. Their