Autapomorphy

In cladistics, an autapomorphy is a distinctive anatomical feature, known as a derived trait, that is unique to a given terminal group. That is, it is found only in one member of a clade, but not found in any others or outgroup taxa, not even those most closely related to the group (which may be a species, family or in general any clade). It can t...
Found on http://en.wikipedia.org/wiki/Autapomorphy

autapomorphy

a derived trait that is unique to a particular taxon
Found on http://www.kerbtier.de/Pages/Glossar/enGlossar.html
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