单词 | polytomy |
释义 | po·lyt·o·my ![]() 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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