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Re: Trogons and Grebes
A strict phylogenetic taxonomist would probably call this clade
Fortunately phylogenetic nomenclature* is not synonymous with the Pan-
convention. At least not yet.
* Actually... there is no such thing as "phylogenetic taxonomy". There's
just phylogenetic systematics (cladistics) and phylogenetic nomenclature.
Sangster, G. 2005.
Ah. So not "Gangster". <phew> :-)
"A node- rather than a stem-based
definition of Mirandornithes is selected because its sister-taxon is
unresolved (see below)
What about *Juncitarsus*, as proposed by Mayr?
If _Neogaeornis_ and _Polarornis_ (both foot-propelled diving
birds fro the LK) are indeed divers (loons), then the
Gaviidae is a very ancient group.
As reported, even molecular divergence date estimates say they're too old
for that. :-)