Monophyletic Group
단계통군
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<speciesfyi-glossary slug="monophyletic-group"></speciesfyi-glossary>Definition
A group including an ancestor and all of its descendants, reflecting true evolutionary relationships.
Detailed Explanation
Monophyletic groups (clades) are the gold standard in modern systematics because they reflect real evolutionary history. Mammals, birds, and flowering plants are monophyletic. In contrast, "fish" is not monophyletic — it excludes tetrapods, which descended from lobe-finned fish ancestors. Recognizing monophyletic groups ensures classification reflects genealogical relationships rather than overall similarity.