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Re: New PaleoBios paper - diplodocoid phylogenetic taxonomy

David Marjanovic wrote-

> Ornithothoraces,

Node-based, *Iberomesornis* + Neornithes. Since *I.* has turned out to
belong to Enantiornithes, Ornithothoraces forms a node-stem triplet with
Enantiornithes and Euornithes.

Two: (Sinornis + Neornithes) (Sereno, 1998)

> Pygostylia,

One, IIRC:
Node-based, *Confuciusornis* + Neornithes.

(fused distal caudal vertebrae homologous with Vultur gryphus) (Gauthier and de Queiroz, 2001)

> Carinatae,

At least two:
- Node-based: *Ichthyornis* + Neornithes.
- Apomorphy-based: keel on sternum in all members of the population (so
*Confuciusornis* is just outside).

Three: (Neornithes <- Hesperornis) (Cracraft, 1986)

> Euornithes,

Kurochkin used Euornithiformes, not Euornithes, so let's stick with Sereno
(1998 -- not 1999), who (this time) made a really good decision:
Stem-based: Neornithes inside, *Sinornis santensis* outside.
Of course he could have used *Enantiornis* instead of *Sinornis*, but
currently this doesn't make any practical difference.

Two: (Ibermoesornis + Neornithes) (Sanz and Buscalioni, 1992)

Mickey Mortimer