Gracilisuchus stipanicicorum (Romer 1972; Butler et al. 2014; Ladinian, Middle Triassic, ~230 mya, 30 cm long; holotype PULSR8) is a basal crocodilomorph. It was derived from a sister to Dibothrosuchus and preceded both Saltopus and Scleromochlus.

Gracilisuchus was originally considered an ornithosuchid by Romer (1972). Others considered it to nest between Parasuchus and Stagonolepis (Benton and Clark 1988), as the sister to Postosuchus (Juul 1994) or Postosuchus and Erpetosuchus (Benton and Walker 2002).

The hind limb paper of Leuona and Desojo (2011) is about PVL 4597, a different genus. Butler et al. (2014) nested Turfanosuchus, Gracilisuchus and Yonghesuchus together in a clade. Yonghesuchus is close, but other omitted taxa are closer to the other two.

Skull image below from Butler et al. 2014.

Lagosuchus talampayensis (Romer 1971) is a smaller specimen found on the same slab as Gracilisuchus. In the LRT it nests with Saltopus.

Phyllodontolsuchus lufengensis (Harris et al 2000; Sinermurian, Early Jurassic China, 200mya, BVP568-L12) had leaf-shaped posterior teeth. Traditionally considered a sphenosuchian, but here nests with Coloradisuchus, a taxon described 17 years later.

Benton MJ and Clark JM 1988. Archosaur phylogeny and the relationships of the Crocodilia in MJ Benton (ed.), The Phylogeny and Classification of the Tetrapods 1: 295-338. Oxford, The Systematics Association.

Butler RJ, Sullivan C, Ezcurra MD, Liu J, Lecuona A and Sookias RB 2014. New clade of enigmatic early archosaurs yields insights into early pseudosuchian phylogeny and
the biogeography of the archosaur radiation. BMC Evolutionary Biology 14:1-16.

Harris JD et al 2000. A new and unusual sphenosuchian (Archosauria: Crocodylomorpha) from the Lower Jurassic Lufeng Formation, People's Republic of China. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 215(1): 47–68.

Juul L 1994. The phylogeny of basal archosaurs. Palaeontographica africana 1994: 1-38.

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 XX:1–40.

Martinez RN, Alcober OA and Pol D 2017. A new protosuchid crocodyliform (Pseudosuchia, Crocodylomorpha) from the Norian Los Colorados Formation, northwestern Argentina. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2018.1491047.

Parrish JM 1993. Phylogeny of the Crocodylotarsi, with reference to archosaurian and crurotarsan monophyly. Journal of Vertebrate Paleontology 13(3):287-308.

Romer AS 1971. The Chañares(Argentina) Triassic reptile fauna. Two new bu incompletely known long-limbed pseudosuchians. Breviora 378:1–10.

Romer AS 1972. The Chañares (Argentina) Triassic reptile fauna. An early ornithosuchid pseudosuchian, Gracilisuchus stipanicicorum, gen. et sp. nov. Breviora 389:1-24.

wiki/Gracilisuchus
wiki/Coloradisuchus
wiki/Phyllodontosuchus