Leptosuchomorpha

Leptosuchomorpha Temporal range: Late Triassic 237–201.4 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Skull of Smilosuchus gregorii in the American Museum of Natural History
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauromorpha
Clade:	Archosauriformes
Order:	†Phytosauria
Family:	†Parasuchidae
Subfamily:	†Mystriosuchinae
Clade:	†Leptosuchomorpha Stocker, 2010
Subgroups
†Leptosuchus †Pravusuchus †Smilosuchus †Mystriosuchini

Leptosuchomorpha is a clade of phytosaurs. It is a node-based taxon defined by Michelle R. Stocker in 2010 as the last common ancestor of Leptosuchus studeri and Pseudopalatus pristinus and all of its descendants.^[1] A new definition was proposed by Andrew S. Jones and Richard J. Butler in 2018 as the last common ancestor and all descendants of Smilosuchus lithodendrorum, Leptosuchus studeri, and Machaeroprosopus pristinus to reflect the new interrelationships of Phytosauria they recovered.^[2]

Phylogeny

Below is a cladogram from Stocker (2012)^[1]

Phytosauria

"Paleorhinus" scurriensis Paleorhinus bransoni "Paleorhinus" sawini Phytosauridae Brachysuchus megalodon Angistorhinus Rutiodon carolinensis "Machaeroprosopus" zunii Protome batalaria Leptosuchomorpha "Phytosaurus" doughtyi TMM 31173-120 Leptosuchus crosbiensis Leptosuchus studeri Smilosuchus lithodendrorum Smilosuchus adamanensis Smilosuchus gregorii Pravusuchus hortus Pseudopalatinae Pseudopalatus mccauleyi Mystriosuchus westphali Pseudopalatus pristinus

References

1. Stocker, M. R. (2012). "A new phytosaur (Archosauriformes, Phytosauria) from the Lot's Wife beds (Sonsela Member) within the Chinle Formation (Upper Triassic) of Petrified Forest National Park, Arizona". Journal of Vertebrate Paleontology. 32 (3): 573–586. doi:10.1080/02724634.2012.649815. S2CID 129527672.
2. Jones, Andrew S.; Butler, Richard J. (10 December 2018). "A new phylogenetic analysis of Phytosauria (Archosauria: Pseudosuchia) with the application of continuous and geometric morphometric character coding". PeerJ. 6: e5901. doi:10.7717/peerj.5901. PMC 6292387. PMID 30581656.