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Derived traits and symplesiomorphy

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(A) If we mistakenly believe that dark coloration is a derived trait, this may not lead us to misinterpret the relationships among species 1, 2, and 3. (B) If a derived trait has arisen recently and appears in only one of the two most closely related species, the two more distantly related species share the same trait. In this case, we call the trait a symplesiomorphy.
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