Definition: Panarthropoda is a group of archaic marine reptiles that lived during the Mesozoic era, approximately 69 million years ago. These creatures were characterized by their elongated heads and long necks, which allowed them to dive deep into the ocean for food. Their unique adaptations included the use of flippers or claws to help them swim through the water. Panthropanthos, a group of these archaic reptiles, also known as "panther-like"
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