👉 Plesiosauroids are a group of extinct marine reptiles that lived during the Late Cretaceous period, around 68 million years ago. Plesiosauroids were characterized by their large head and neck, which they used to hunt their prey. They had a single, long, flexible gill pouch on their back and a mouth with two rows of teeth. Plesiosauroids lived in the oceanic depths of the sea, where they were able to capture small fish
