Seaweeds are a polyphyletic group, green algae are a monophyletic group, and red and brown algae represent paraphyletic groups.
Any group of organisms with a formal taxonomic designation is referred to as a taxon.
A polyphyletic taxon is made up of unrelated species descended from many ancestors, while a monophyletic taxon is made up of a collection of organisms descended from a single ancestor.
Since all species are connected, any conceivable group is logically "monophyletic" according to these ambiguous criteria.
A monophyletic taxon is one that contains the most recent common ancestor of a collection of species and all of its offspring, according to contemporary use.
Such clusters are occasionally referred to as holophyletic. A paraphyletic taxon can also be identified as one that contains the most recent common ancestor but not all of its descendants. If a taxon does not contain the common ancestor of every member, it is said to be polyphyletic.
Red and brown algae are paraphyletic groups, green algae are a monophyletic group, and seaweeds are a polyphyletic group.
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