Ateleopodiforms

Ateleopodiforms are a group of extinct marine reptiles that lived during the Triassic and Jurassic periods, approximately 248 to 145 million years ago. They are characterized by their unique, paddle-like limbs, which are believed to have been used for swimming rather than walking. Ateleopodiforms are further divided into two main groups: the Ateleopoda and the Thalattosauria.

The Ateleopoda, also known as the "paddlefishes," were small, fish-like reptiles that possessed long, paddle-like limbs and a streamlined body. They are believed to have been semi-aquatic, spending much of their time in the water but also capable of moving on land. The Thalattosauria, on the other hand, were larger and more diverse, including both marine and terrestrial species. They possessed a variety of limb shapes and sizes, ranging from long, paddle-like limbs to short, stubby limbs.

Ateleopodiforms are thought to have been important predators in their ecosystems, feeding on a variety of prey including fish, invertebrates, and other reptiles. Their unique adaptations for swimming and their diverse range of limb shapes and sizes make them an important group for understanding the evolution of marine reptiles and their role in ancient ecosystems.