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Re: Shuvosaurus, 3rd impressions
However, in related Turfanosuchus (JVP 21(1) covergirl), my candidate
for the basal archosaur, the lacrimal shares the dorsal eyebrow exactly
as in Shuvosaurus, except that the exposure to the frontal is tentative.
*Turfanosuchus* alone may not be able to tell you much.
Wu Xiaochun, Liu Jun & Li Jinling: The anatomy of the first archosauriform
(Diapsida) from the terrestrial Upper Triassic of China, Vertebrata
PalAsiatica 39(4), 252 -- 264 + Pl. I (?December? 2001)
Abstract: "*Yonghesuchus sangbiensis*, a new genus and species of the
Archosauriformes, is erected on the basis of its peculiar cranial features.
This taxon represents the first record of tetrapods from the Late Triassic
terrestrial deposits of China. Its discovery is significant not only to our
study on the phylogeny of the Archosauriformes but also to our understanding
of the evolution of the Triassic terrestrial vertebrate faunae in China. The
presence of pterygoid teeth may exclude the new form from the [crown group]
Archosauria [...certainly it does!], and the apomorphic position of the
foramen for the internal carotid artery indicates that the new form appears
to be phylogenetically closer to the Archosauria than are *Turfanosuchus*
and the Proterochampsidae. Comparisons with these taxa suggest that the *Y.
sangbiensis*-bearing Tongchuan Formation is probably of early Late Triassic
Material: 2 halfway complete skulls + 1 partial neck.
As reconstructed, the nasal and the prefrontal meet, and the lacrimal does
not participate in the dorsal side of the skull. Worse yet, the prefrontal
meets the maxilla and separates the orbit from the antorbital fenestra. I
wonder how much we can trust the reconstruction...
p. 263: "From the above discussion, *Euparkeria*, *Turfanosuchus dabanensis*
(if the intercentrum was present between the post-axial vertebrae), the
Proterochampsidae, and *Yonghesuchus* appear to be successively closer in
relationship to the Archosauria. This pattern of relationships among these
early archosauriforms seems to match their geological occurrences: [...]"