Protopyknosia

Protopyknosia Temporal range: Late Triassic, ~229–211 Ma PreꞒ Ꞓ O S D C P T J K Pg N Carnian-Norian
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauromorpha
Clade:	Archosauriformes
Clade:	†Protopyknosia Nesbitt et al., 2021
Genera
†Kranosaura †Triopticus

Protopyknosia is an extinct clade of archosauriform reptiles from the Late Triassic of India and the United States. First identified by Sterling Nesbitt et al. in 2021,^[1] the clade contains two genera: Kranosaura and Triopticus. Members of Protopyknosia characteristically have an unusually domed head reminiscent of the later pachycephalosaurian dinosaurs in an example of convergent evolution.^[2]

References

see Sauropsida
Archosauromorpha	see below↓

Jesairosaurus?
Trachelosauridae	Austronaga Dinocephalosaurus Fuyuansaurus? Gracilicollum? Protanystropheus Pectodens Sclerostropheus? Trachelosaurus
Sharovipterygidae?	Ozimek Sharovipteryx
Tanystropheidae	Amotosaurus Augustaburiania Cosesaurus Fuyuansaurus? Gracilicollum? Gwyneddosaurus Langobardisaurus Luxisaurus Macrocnemus Raibliania Sclerostropheus? Tanystropheus Tanytrachelos Sharovipterygidae?

†Boreopricea †Cryptovaranoides? †Tasmaniosaurus †Teyujagua
†Allokotosauria	see Allokotosauria
†Rhynchosauria	see Rhynchosauria
†Prolacertidae?	Kadimakara Prolacerta
Archosauriformes	see below↓

†Antarctanax †Cuyosuchus †Eorasaurus? †Kalisuchus †Koilamasuchus †Sarmatosuchus †Syntomiprosopus
†Proterosuchidae	Archosaurus Chasmatosuchus? Gamosaurus Jaikosuchus Proterosuchus Samsarasuchus Tsylmosuchus? Vonhuenia?
†Protopyknosia	Kranosaura Triopticus
†Erythrosuchidae	Bharitalasuchus Chalishevia Erythrosuchus Fugusuchus? Garjainia Guchengosuchus Shansisuchus Uralosaurus

†Asperoris †Dorosuchus †Heteropelta †Litorosuchus †Polymorphodon †Vancleavea
†Euparkeriidae	Euparkeria Halazhaisuchus Osmolskina
†Proterochampsia	see Proterochampsia

Incertae sedis	†Sikannisuchus? †Smok
Avemetatarsalia	see Avemetatarsalia includes birds
Pseudosuchia	see Pseudosuchia includes crocodilians