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Date: Sun, 24 Jun 2001 12:13:01 +0200
From: David Marjanovic <email@example.com>
To: PhyloCode mailing list <firstname.lastname@example.org>
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.