Hyrotrioskjan on DeviantArthttps://www.deviantart.com/hyrotrioskjan/art/Old-and-newer-rulers-355844210Hyrotrioskjan

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Old and newer rulers

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The late Oligocene is a world in change some new familys arrive on the court and some extinct, not only dragons but any other also.
You see here from left two right: Brutodens, Dryonychus, Appotomerus, Megaceloxus and Hamignathus.
Hamignathus and Megaceloxuls lived during the same time and the chart shows clearly the differences between the primitve Monopterna and the derived Diplopterna. In the next million years some things will change...
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Saiyanstrong's avatar
Are these real animals?  Were theses actually discovered?