PVL 4597 a specimen attributed to Gracilisuchus by Lecuona and Desojo 2011. It is indeed a Ladinian (Late Miiddle Triassic) sister, but nests closer to the base of the Dibothrosuchus clade in the LRT. The vertebral column was shown in Lecuona et al. 2017. The skull was published in her PhD thesis. Phylogenetic miniaturization attended the genesis of this major clade.

Lecuona and Desojo reported: PVL 4597 (the ‘Tucuman specimen’ of Romer 1972, Bonaparte 1975a), nearly complete skull and mandible in articulation, an almost complete presacral vertebral series with articulated paramedian dorsal osteoderms, two sacral vertebrae, an incomplete caudal vertebral series, both ilia, left pubis, both ischia, an almost complete left hind limb, fragmentary right hind limb, and several undetermined fragments of bone.

Fruitachampsa callisoni (Clark 2011; 35cm to <1m in length, skull length up to 9cm) Late Jurassic, was derived from a sister to the PVL 4597 specimen in the LRT. The antorbital fenestra was redued to a small triangle near the orbit. Two large palpebrals are present. The posterior teeth have flattened tops with ridges front to back. The choanae are merged medially. Vomers are absent. Procoelus vertebrae are present, as in members of the Fenestrasauria. Thin osteoderms line the dorsal vertebrae. Four sacral ribs are fused to the pelvis, as befitting a biped. Elongate proximal carpals are present. Traditionally considered a member of the clade Shartegosuchidae.

Clark JM 2011. A new shartegosuchid crocodyliform from the Upper Jurassic Morrison Formation of western Colorado. Zoological Journal of the Linnean Society. 163 (s1): S152–S172.

Lecuona A and Desojo, JB 2011. Hind limb osteology of Gracilisuchus stipanicicorum (Archosauria: Pseudosuchia). Earth and Environmental Science Transactions of the Royal Society of Edinburgh 102 (2): 105–128.

Lecuona A, Desojo JB and Pol D 2017. New information on the postcranial skeleton of Gracilisuchus stipanicicorum (Archosauria: Suchia) and reappraisal of its phylogenetic position. Zoological Journal of the Linnean Society zlx011 1–40.

wiki/Fruitachampsa