(systematics) An approach to biological systematics in which organisms are grouped based upon synapomorphies (shared derived characteristics) only, and not upon symplesiomorphies (shared ancestral characteristics).
(phylogenetics) The living representatives of a collection of species, together with their ancestors back to their most recent common ancestor as well as all of that ancestor's descendants.
(biology) A branching diagram illustrating the potential evolutionary relationships among biological organisms or other entities which the tree-maker hypothesizes share a common ancestor.
(phylogenetics) A paraphyletic group consisting of an ancestor and all its descendants, excluding the living representatives of a collection of species.
Of or relating to Richard Wettstein (1863–1931), Austrian botanist, whose Wettstein system was one of the earliest taxonomic systems based on phyletic principles.
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