单词	polyphyletic
释义	polyphyletic /ˌpɒlɪfʌɪˈlɛtɪk / adjective Biology (Of a group of organisms) derived from more than one common evolutionary ancestor or ancestral group and therefore not suitable for placing in the same taxon: the aschelminthes may be a polyphyletic grade... The present study, as well as previous molecular studies, suggest that the oegopsid squids represent a polyphyletic group with uncertain phylogenetic affinities. Loriciferans were originally assigned to the paraphyletic or polyphyletic group called Aschelminthes. The taxonomy of the group is not well resolved, with many family-group taxa considered paraphyletic or polyphyletic, and several subfamilies are unplaced at the family level.
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