This amazing illustration by Corbin Rainbolt, features an unknown species of a large eutriconodont mammaliaform winning a fight over a piece of carrion with a small ancestor of today's mammals. A new study indicates that it was mammaliaforms that radiated early, not dinosaurs, that held back our today's mammal ancestors from becoming more specialized during the Mesozoic. Eutriconodonts existed in Asia, Africa, Europe, North and South America. The order was named by Kermack in 1973. They range in size from the smallest eutriconodonts probably weighing around 50 grams. The largest, Repenomamus giganticus, as much as 14 kg.
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