monophyletic

Of or relating to a group of taxa that includes the common ancestor of all the members as well as all descendants of that ancestor.

Of or derived from one stock or source.

Of or pertaining to a single phylum: said of a group of any grade in zoology, with reference to the origin of all the members of such group from a common ancestor: opposed to polyphyletic.

Of or pertaining to a single family or stock, or to development from a single common parent form; — opposed to polyphyletic.

Of, pertaining to, or affecting a single phylum (or other taxon) of organisms.

Deriving from a single clade (monophylum).