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Date: Sun, 24 Jun 2001 12:13:01 +0200
From: David Marjanovic <david.marjanovic@gmx.at>
To: PhyloCode mailing list <phylocode@ouvaxa.cats.ohiou.edu>
Subject: Re: Crown groups mainstream?
> So friggin' what if
> multis are not member of Mammalia? They can still be mammals. So
> may anything grouped in Mammaliaformes, which is the stem
> opposing the cynodonts.
(Rather irrelevant here, but Cynodontia is a node that includes mammals; I
haven't figured out whether Mammaliaformes is a node or a stem, but -formes
is usually applied to nodes.)
People will, for obvious reasons, continue to refer to Mammalia, and nothing
else, as mammals. No problem for PT, though.
> Pterosaurs are irrelevant to Archosauria -- they cannot
> comprise the definition of a crown-group, as they are extinct.
Indeed.
> As well, Dave Peters quite clearly espouses and convinces the
> relationship of pterosaurs as basal to archosaurs, as
> archosauriforms closer to lizards than crocs (lepidosauriforms),
> as members of Archosauromorpha, and which becomes a senior
> subjective synonym of Ornithodira by content.
Prolacertiforms, not lizards:
Sauria (node)
|--Lepidosauromorpha (stem)
| |--maybe ichthyosaurs and/or plesiosaurs, who knows
| `--Lepidosauriformes (node)
| |--Sphenodontia (or is it -ida?)
| `--Lepidosauria (lizards including snakes)
`--Archosauromorpha (stem)
|--Trilophosauridae
`--+--Rhynchosauria
`--*--Prolacertiformes (a misnomer)
| `--Pterosauria if Peters is right
`--Archosauriformes = non-crown A.sauria (node)
|== various basal groups (*Proterosuchus*...)
`-- crown Archosauria (node)
|--Crurotarsi (stem, includes crocs)
`--**--Pterosauria traditionally
`--Dinosauriformes (node)
|== a few basal species
`--Dinosauria (node)
* Ornithodira if Peters www.pterosaurs.net is right
** Ornithodira if he's wrong
Ornithodira = (*Pterodactylus antiquus* + *Passer domesticus*)
Ornithodira is always, no matter what happens (save synonymy), composed of
Pterosauromorpha (*P. a.* > *P. d.*) and Dinosauromorpha (*P. d.* > *P.
a.*).
The name Prolacertiformes (I don't know its definition, if it has one) is
based on the superficially lizard-like *Prolacerta* which was thought to be
the oldest lizard when it was discovered. Turned out to be wrong.