Assertion: tuatara | /r/CapableOf | deserve its epithet of living fossil
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text: The reason the tuatara deserves its epithet of "living fossil" is that it's the simplest identified amniote (vertebrates that lay their eggs on land or incubate them within the female's body); this reptile's heart is extremely primitive compared to those of turtles, snakes and lizards, and its brain structure and posture harks back to the ultimate ancestors of all reptiles, the amphibians.