Mikko's Phylogeny Archive Main Groups of Terrestrial Vertebrates   Synapsida - Family-level tree of "Pelycosaurs"

After Carroll, 1988 and Laurin & Reisz, 1997-1998 ["The Tree of Life"]

<==o Synapsida (synapsids; mammal-like amniotes; yksiohimoaukkoiset amniootit)
   `--o Pelycosauria
      |--o †Caseasauria
      |  |-- †Eothyrididae
      |  `-- †Caseidae
      `--o Eupelycosauria
         |-- †Varanopseidae
         `--+-- †Ophiacodontidae
            `--+-- †Edaphosauridae
               `--o Sphenacodontia [Sphenacodontidae sensu lato]
                  |== †Haplodontinae [paraphyletic]
                  `--o Sphenacodontoidea
                     |-- †Sphenacodontidae sensu stricto
                     `-- Therapsida (therapsids; nisäkäsmäiset synapsidit)

Reference(s):

Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698

Carroll, R. L., 1988: Appendix. 594-648.
in Carroll, R. L. 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698

Laurin, M. & Reisz, R. R., 1997-1998: Synapsida - Mammals and their extinct relatives.
–iNet: The Tree of Life: http://tolweb.org/tree/eukaryotes/animals/chordata/synapsida.html