Crown Group reference edit

"Docodonts are not quite as closely related to the placentals and marsupials as the monotremes are, so they are not included among the crown-group mammals"

If extinct lineages cannot be in a crown grown, is this sentence correct? That is, docodonts aren't in the crown because they're extinct, not because they are "are not quite as closely related to..." ?????? Heds (talk) 22:26, 8 March 2013 (UTC)Reply

All animals, extinct or not, are in a crown, crown Opisthokonta. Docodonts are also in crown Amniota. To be in crown Whateveria, though, one has to be more closely related to some extant whateverian than to some other. Docodonts are equally related to placentals, marsupials, and monotremes, the extant mammals, so they are not in crown Mammalia. Though extinct, mammoths are in this crown; they are more closely related to elephants than to humans. Peter Brown (talk) 22:44, 8 March 2013 (UTC)Reply

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