|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was synonymized subjectively with Theriodontia by Zittel (1890); it was reranked as the superorder Pelycosauria by Nopcsa (1928); it was reranked as the suborder Pelycosauria by Swinton (1934) and Kuhn (1946); it was reranked as the subclass Pelycosauria by Langston (1965).
It was assigned to Diaptosauria by Osborn (1903) and Osborn (1904); to Rhynchocephalia by Cope (1878), Osborn (1903) and Case (1907); to Monozygocrotapha by Nopcsa (1928); to Theromorpha by Baur (1887) and Roxo (1937); to Theromorpha by Swinton (1934) and Kuhn (1946); to Theromorphoidea by Huene (1954); to Captorhina by Olson and Barghusen (1962); to Synapsida by Olson and Beerbower (1953) and Olson (1962); to Theromorpha by Kuhn (1966); to Reptilia by Nopcsa (1923), Langston (1965), Berman (1977) and Eberth and Brinkman (1983); and to Synapsida by Romer and Price (1940), Haughton and Brink (1954), Lewis and Vaughn (1965), Olson (1966), Daly (1973), Currie (1977), Langston and Reisz (1981) and Carroll (1988).
|Year||Name and author|
|1878||Pelycosauria Cope p. 528|
|1887||Pelycosauria Baur p. 102|
|1903||Pelycosauria Osborn p. 276|
|1904||Pelycosauria Osborn p. 110|
|1907||Pelycosauria Case p. 17|
|1928||Pelycosauria Nopcsa p. 171|
|1934||Pelycosauria Swinton p. 52|
|1937||Pelycosauria Roxo p. 43|
|1940||Pelycosauria Romer and Price p. 14|
|1946||Pelycosauria Kuhn p. 56|
|1953||Pelycosauria Olson and Beerbower p. 399|
|1954||Pelycosauria Haughton and Brink p. 5|
|1954||Pelycosauria Huene p. 27|
|1962||Pelycosauria Olson p. 95|
|1962||Pelycosauria Olson and Barghusen p. 21|
|1965||Pelycosauria Langston p. 6|
|1965||Pelycosauria Lewis and Vaughn p. C26|
|1966||Pelycosauria Kuhn p. 118|
|1966||Pelycosauria Olson p. 301|
|1973||Pelycosauria Daly p. 587|
|1977||Pelycosauria Berman p. 108|
|1977||Pelycosauria Currie p. 929|
|1981||Pelycosauria Langston and Reisz p. 74|
|1983||Pelycosauria Eberth and Brinkman p. 2|
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|H. F. Osborn 1903||Raptorial, carnivorous ambulatory Diaptosauria. Skull progressively compressed, dorsal spines elongated, rail abbreviated. Vertebrae perforated by notochord, amphicoelous. Ribs two-headed; capitula
mainly hypocentral in attachment. Interclavicle T-shaped. Coracoid and procoracoid (in certain forms) separated by suture. A puboischiadic fenestra between pubis and ischium (Case). Humerus with entepicondylar (ulnocondylar) foramen.