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Old 12-11-2019, 11:30 PM
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Colibri is offline
SD Curator of Critters
Join Date: Oct 2000
Location: Panama
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Originally Posted by Andy L View Post
That's not quite true. "Butterflies" are a monophyletic group, so are "humans" - "Whales" are a polyphyletic group, though.
You misunderstand. All of the first-mentioned groups (except trees, and they are being used as a stand-in for multicellular green plants) are monophyletic. But if they are removed, the second group becomes paraphyletic. For the second groups to be monophyletic, the first groups must be considered to be part of them. (And "whales" is being used in the broad sense, to include dolphins and other toothed whales. In that sense all cetaceans are monophyletic.)

Last edited by Colibri; 12-11-2019 at 11:34 PM.