👉 Cynodonteae is a family of extinct marine reptile that lived during the Mesozoic era, around 56 million years ago. They were characterized by their unique long, slender necks and elongated, curved bodies, which allowed them to swim through the water efficiently. Cynodonteae featured a distinctive crest-like structure on their head, known as a "cynodon," which is similar to the crest in birds but not quite identical. These reptiles were also