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Description: The tetrapod vertebrates (bracketed in green) form one monophyletic group including birds, crocodilians, turtles, reptiles, mammals, and amphibians. Their unique common ancestor is circled in green. “Fish”—lampreys, cartilaginous fishes, ray-finned fishes, and lobe-finned fishes ? are not a monophyletic group. Adapted from the Center for North American Herpetology (2010). Picture Stats: Views: 16567 Filesize: 243.07kB Height: 879 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=5290