(Of a group of organisms) descended from a common evolutionary ancestor or ancestral group, but not including all the descendant groups.
- In fact, it is possible that the group is paraphyletic; the last common ancestor of all polymerid trilobites may also have been ancestral to the agnostids as well.
- These taxa together form a paraphyletic group at the base of the clade of biramous arthropods.
- To represent this, we have used multiple lines drawn to paraphyletic groups in the cladogram above.
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