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. 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.

Phylogeny

Below is a cladogram from Stocker (2012)

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
"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
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
"Paleorhinus" sawini
PhytosauridaeBrachysuchus 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
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
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
"Phytosaurus" doughtyi
TMM 31173-120
Leptosuchus crosbiensis Leptosuchus studeri
Leptosuchus crosbiensis
Leptosuchus studeri
Smilosuchus lithodendrorum Smilosuchus adamanensis Smilosuchus gregorii Pravusuchus hortus Pseudopalatinae Pseudopalatus mccauleyi Mystriosuchus westphali Pseudopalatus pristinus
Smilosuchus lithodendrorum Smilosuchus adamanensis Smilosuchus gregorii
Smilosuchus lithodendrorum
Smilosuchus adamanensis Smilosuchus gregorii
Smilosuchus adamanensis
Smilosuchus gregorii
Pravusuchus hortus Pseudopalatinae Pseudopalatus mccauleyi Mystriosuchus westphali Pseudopalatus pristinus
Pravusuchus hortus
PseudopalatinaePseudopalatus mccauleyi Mystriosuchus westphali Pseudopalatus pristinus
Pseudopalatus mccauleyi
Mystriosuchus westphali Pseudopalatus pristinus
Mystriosuchus westphali
Pseudopalatus pristinus