|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was synonymized subjectively with Iguanodon by Lydekker (1888); it was synonymized subjectively with Camptosaurus by Zittel (1890), Woodward and Sherborn (1890), Huene (1909), Gilmore (1909), von Zittel (1911), Romer (1956), Tatarinov (1964), Kuhn (1964), Romer (1966), Norman (2004) and Pereda Suberbiola et al. (2006).
It was assigned to Ornithopoda by Sauvage (1914); to Iguanodontidae by Swinton (1970) and Galton (1974); to Camptosauridae by Winkler (1893), Naish and Martill (2007), Ruiz-Omeñaca et al. (2007) and Ruiz-Omeñaca et al. (2008); and to Styracosterna by McDonald et al. (2010) and Párraga and Prieto-Márquez (2019).
|Year||Name and author|
|1888||Cumnoria Seeley p. 698|
|1893||Cumnoria Winkler p. 113|
|1914||Cumnoria Sauvage p. 254|
|1970||Cumnoria Swinton p. 214|
|1974||Cumnoria Galton pp. 151-152|
|2007||Cumnoria Naish and Martill p. 495|
|2007||Cumnoria Ruiz-Omeñaca et al. p. 83|
|2008||Cumnoria Ruiz-Omeñaca et al. p. 61|
|2010||Cumnoria McDonald et al. p. 33 fig. 39|
|2019||Cumnoria Párraga and Prieto-Márquez p. 254|
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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.