Synapsida

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladi: Eupelycosauria – †Caseasauria – †Pelycosauria (informal group)
Ordo: Therapsida

Synapsida Osborn, 1903

Bakker, Robert T. (1986), The Dinosaur Heresies, William Morrow.

Superclass Theropsida

• Pelycosauria
• Class Neotheropsida
  • Proto-mammals
  • Mammals

From The vertebrate life, 6th ed.

[Fig. 18.1:]

Synapsida

• Eothyrididae†
• Caseidae†
• Eupelycosauria
  • Varanopseidae†
  • Ophiacodontidae†
  • Edaphosauridae†
  • Sphenacodontia
    • Sphenacodontidae†
    • Therapsida
      • Biarmosuchia†
      • Dinocephalia†
      • Anomodontia†
      • Theriodontia
        • Gorgonopsia†
        • Eutheriodontia
          • Therocephalia†
          • Cynodontia
            • Procynosuchidae†
            • Thrinaxodontidae†
            • Eucynodontia
              • Cynognathidae†
              • Gomphodontia†
              • Cynognathia
                • Tritheledontidae†
                • Mammalia
                  • basal mammals†
                  • Docodonta†
                  • stem mammals
                    • Monotremata
                    • Triconodonta†
                    • Multituberculata†
                    • Holotheria
                      • Symmetrodonta†
                      • Dryolestoidea†
                      • Tribosphenida
                        • basal tribosphenids†
                        • Theria
                          • Marsupialia
                          • Eutheria

Osborn, 1903: The reptilian subclasses Diapsida and Synapsida and the early history of the Diaptosauria. Memoirs of the AMNH ; v. 1, pt. 8 AMNH