This is a monophyletic group.

A group of replicators consisting of (1) their most recent common ancestor (the founder) and (2) all offspring of members of the group (that is, all descendants of the founder). A monophyletic group. A descent group of chain letters.

A group of monophyletic organisms or DNA sequences that include all of those in the analysis that are descended from a particular common ancestor.

A lineage of organisms or alleles that comprises an ancestor and all its descendants.