monophyletic
Of, pertaining to, or affecting a single phylum (or other taxon) of organisms.
Other meanings
Deriving from a single clade (monophylum).
Descending from a single ancestral species.
Where this comes from
This definition is adapted from “monophyletic” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.