Monophyly
From Palaeos
Monophyly refers to any taxon that includes the most recent common ancestor of all those organisms, and all the descendants of that common ancestor. A Monophyletic taxon, or clade, is the building block of the cladistic system of taxonomy and phylogeny. Monophyletic groups are discovered (but not defined) by synapomorphies.
Examples: Insects, Vertebrates, Mammalia, Angiosperms, etc, etc.
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MAK070216 ([www.palaeos.com/Systematics/Cladistics/monophyletic.htm Palaeos com page])
