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RE: Juvenile specimen of Yunnanosaurus from Early Jurassic of China
> Date: Thu, 29 Aug 2013 08:12:11 -0700
> From: firstname.lastname@example.org
> To: email@example.com
> Subject: Juvenile specimen of Yunnanosaurus from Early Jurassic of China
> Finally, ZMNH-M8739 constitutes a monophyletic group with Y. robustus
> (holotype), and Y. huangi is nesting this clade in the phylogenetic
> tree of the present analysis. Comparison of juvenile and adult
> specimen reveals distinctive growth changes of Y. robustus. This clade
> is positioned in an unnamed clade at a sister taxon of Sauropoda.
> Finally, some members of the so-called prosauropod dinosaurs
> constitute a monophyletic group in the present result.
To elaborate on this, in case anyone else is curious:
Included sauropodomorphs basal to the Prosauropoda/Sauropoda split include, in
ascending order: Saturnalia (actually considered outside Sauropodomorpha sensu
Sekiya et al, as sister taxon of the outgroup taxon Guaibasaurus),
Thecodontosaurus, Efraasia, and Anchisaurus.
The monophyletic Prosauropoda includes the still-unnamed "Gyposaurus" sinensis
as the most basal member, followed by Sarahsaurus, Massospondylidae
(Massospondylus & Adeopapposaurus), and Plateosauridae (Plateosaurus,
Riojasaurus, Coloradisaurus & Lufengosaurus).
The sister group of Sauropoda referred to as an "unnamed clade" in the abstract
(hasn't Yunnanosauridae been named already?) includes a monophyletic
Yunnanosaurus, and a clade including Jingshanosaurus and Seitaad.
Plateosauravus is in an unresolved trichotomy with yunnanosaurids and
The basalmost members of Sauropoda (sensu Sekiya et al) form a comb including
Antetonitrus, Aardonyx, Blikanasaurus, Lessemsaurus, and Melanorosauridae
(Camelotia & Melanorosaurus). Lamplughsaura is also a basal sauropod and is
found as the sister taxon of the gravisaurs.