An autapomorphy in cladistics is a derived trait that is unique to a given taxon. That is, it is shared by all the ingroup taxa of that clade, but not found in any outgroup taxon, not even those most closely related to the clade. This cladogram shows the relationship among various insect groups. ... A taxon (plural taxa), or taxonomic unit, is a grouping of organisms (named or unnamed). ... In sociology, an ingroup is a social group towards which an individual feels loyalty and respect, usually due to membership in the group. ... A clade is a term belonging to the discipline of cladistics. ...
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