👉 Palaeostracan is a scientific term that refers to fossilized, extinct, or prehistoric creatures. In paleontology, palaeostracans are classified into four groups based on their age and size: Cretaceous Palaeostracans (135 million years ago), Jurassic Palaeostracans (160 million years ago), Permian Palaeostracans (240-270 million years ago), and Tri
