A grouping that includes an ancestor and some, but not all, of the descendants of that ancestor is described as:

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A grouping that includes an ancestor and some, but not all, of the descendants of that ancestor is described as paraphyletic. This is because paraphyletic groups do not include all descendants of a common ancestor, and thus are not considered to be natural or valid evolutionary groups.

A Grouping That Includes an Ancestor and Some, but Not