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The fossil record suggests that the stem group of mammals exhibited a mix of primitive and derived traits before the rise of crown mammals.
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The fossil record suggests that the stem group of mammals exhibited a mix of primitive and derived traits before the rise of crown mammals.
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Related words
stem group
Noun
Japanese Meaning
（系統学）幹群：先祖とそのすべての子孫からなるパラフィレティック（系統的に不完全な）なグループ。ただし、特定の現存する種群の代表は除外される。
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