diphyletic theory

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diphyletic theory

phylogeny

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animal lineage

In phylogeny: Animal evolution
The alternative diphyletic theory has been proposed by many zoologists. It contends that the higher metazoans had two lines of descent; one led to annelids, arthropods, and mollusks, and the other led to echinoderms and chordates. Both groups emanated from an ancient flatworm.
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