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polyphyletic

A polyphyletic taxon is a group composed of a number of organisms which might bear some similarities, but does not include the most recent common ancestor of all the member organisms (usually because that ancestor lacks some or all of the characteristics of the group). The taxon shares derived characters which originated several times by convergence.Illustration: Aves / / Crocodilia /Mammalia Dinosauria / / / Synapsida Reptilia / / / AmniotaIn the above diagram the group of ``warm-blooded animals'', which consists of Mammalia and Aves is a polyphyletic group. polyphyletic taxa are considered invalid or unnatural groupings, and are not accepted in taxonomies.

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