or in general any clade). It can therefore be considered as an apomorphy in relation to a single taxon. The word autapomorphy, introduced in 1950 by German entomologist Willi Hennig, is derived from the Ancient Greek words (autós), meaning "self"; (apó), meaning "away from"; and (morphe), meaning "shape, form".

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Background

Because autapomorphies are present only

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