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单词 polytomy
释义
po·lyt·o·my (pə-lĭtə-mē)
n.
In a cladogram, a point from which two or more new branches diverge, representing either of two cases:
a. A multiple speciation event in which two or more species diverge from the same ancestor. Also called hard polytomy.
b. A speciation event in which two or more species are presumed to descend from the same ancestor, but the order of speciation is unknown. Also called soft polytomy.

[POLY- + -TOMY (on the model of DICHOTOMY).]
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更新时间:2025/3/22 6:18:57