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Re: What exactly IS a dinosaur?
So, what's a dinosaur: an animal that's more closely related to
and Ornithischians than it is to other animals. In genealogical tree
something descended from the most recent ancestor of S's and O's (and so
descended from something that WASN'T an ancestor of any of the
More precisely: the most recent common ancestor of S's and O's, and all of
its descendants. The way you wrote it, that MRCA would itself not be a
dinosaur, so Dinosauria would be diphyletic...
Phylogenetic nomenclature. There is no such thing as "phylogenetic
taxonomy", even though you can find that expression in the titles of papers
from the early 1990s (and more recent ones by Sereno).