File:Phylogenetic-Groups.svg.png

Summary
Diagram of Phylogenetic Groups. Phylogenetic groups:

* A monophyletic taxon contains a common ancestor and all of its descendants.

o Diagram: in yellow, the group of "reptiles and birds"

* A paraphyletic taxon contains its most recent common ancestor, but does not contain all the descendants of that ancestor.

o Diagram: in blue, the reptiles

* A polyphyletic taxon does not contain the most recent common ancestor of all its members.

o Diagram: in red, the group of "all warm-blooded animals"