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Lystrosaurus declivis
"Owen (1859) initially described this taxon as the type species of a new genus, Ptychognathus, named for dicynodonts with anteroposteriorly short skulls with tall, strongly deflected snouts. In subsequent papers Owen variously treated Ptychognathus as a distinct genus (e.g. Owen, 1876) or a subgenus of Dicynodon (e.g., Owen, 1860). Although P. declivis was the first named species of Lystrosaurus, it was not combined in that genus until work by Brink (1951), who recognized the validity of the species over L. latirostris (Owen, 1860), which was previously in wide use for the exceptionally tall-snouted species of Lystrosaurus (Cluver 1971; Colbert, 1974; Grine et al., 2006) have all recognized the validity of L. declivis" from Kammerer et al., 2011.
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Year | Name and author |
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1860 | Dicynodon (Ptychognathus) declivis Owen |
1860 | Dicynodon (Ptychognathus) latirostris Owen |
1860 | Ptychognathus declivis Owen |
1860 | Dicynodon (Ptychognathus) declivis Owen p. 49 |
1860 | Dicynodon (Ptychognathus) latirostris Owen p. 51 |
1862 | Ptychognathus alfredi Owen |
1876 | Ptychognathus depressus Owen |
1890 | Ptychosiagum declivis Lydekker |
1916 | Lystrosaurus wagneri Van Hoepen |
1932 | Lystrosaurus declivis Broom |
1951 | Lystrosaurus declivis Brink |
1954 | Lystrosaurus primitivus Toerien |
1988 | Lystrosaurus declivis King |
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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.