An armoured jawless fish (a Cephalaspis, which is a kind of osteostracan). This creature evolved as it adapted to the transition from open sea to freshwater conditions in the Ludlow area towards the end of the Silurian.
Elasmotherium, also known as the Giant Rhinoceros or the Giant Siberian Unicorn, is an extinct species of rhino that lived in the Eurasian area in the Late Pliocene and Pleistocene eras. They have been documented from million years ago, but the most
Helicoprion is a long-lived genus of extinct, eugeneodontid holocephalid fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls." This fossilized jaw shows the spiral dentures.