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<==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)
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
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