Vertebrata
Fish
 
Tetrapoda
Basal Tetrapoda
Temnospondyli
Lepospondyli
Microsauria
Reptilomorpha
 
Reptilia/Amniota
Silvanerpeton
 
Archosauromorpha
Basal Archosauromorpha
Protosynapsida
Synapsida
Mammalia
Protodiapsida
Diapsida
Younginiformes
Enaliosauria
Protorosauria
Archosauriformes
Euarchosauriformes
Archosauria
Dinosauria
 
Lepidosauromorpha
Urumqia clade
Cephalerpeton clade
Captorhinidae
Milleretta Limnoscelis clade
Bolosaurus Diadectes clade
Turtle Pareiasaur clade
Lanthanosuchia
Owenettidae
Lepidosauriformes
Lepidosauria
Tritosauria
Fenestrasauria • Pterosauria
Protosquamata
Squamata
 
 
Aenigmspina

Aenigmaspina pantyffynnonensis (Patrick et al. 2019; Ladinian, Late Triassic (~210 mya), was originally considered an enigma taxon, because so little was known of it. Here the coeval from the same formation taxon, Terrestrisuchus, appears to be a good match. The paired osteoderms were fused at the midline, creating a broad Y-shape.

 
 
Archosauria
Crocodylomorpha
Lewisuchus
Saltoposuchus
Pseudhesperosuchus
Trialestes
 
PVL 4597
Dibothrosuchus
Gracilisuchus
Scleromochlus
Saltopus
 
Terrestrisuchus
Yonghesuchus
Litargosuchus
 
Sphenosuchus
 
Hesperosuchus
Dromicosuchus
Protosuchus
 
Baurusuchus
Simosuchus
 
Caiman
Gavialis
Metriorhynchus
 
 

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