Crown group
（重定向自Crown clade）
![Two distinct crown groups (in red) are illustrated, connected by an ancestor (black circle). The two groups form a larger crown group (lilac).](/Images/godic/202501/07/Stemgroups_Rev0809.png")
![](/Images/godic/202501/07/CollapsedtreeLabels-simplified.svg0809.png")
In phylogenetics, the crown group of a collection of species consists of the living representatives of the collection together with their ancestors back to their most recent common ancestor as well as all of that ancestor's descendants. It is thus a clade, a group consisting of a species and all its descendants.