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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Infraorder: Ceratopsia
Family: Ceratopsidae
Genus: Dysganus
Cope, 1876
Type species
Dysganus encaustus
Cope, 1876

D. encaustus Cope, 1876
D. bicarinatus Cope, 1876
D. peiganus Cope, 1876

Dysganus is the name given to a dubious genus of dinosaur from the Late Cretaceous. It was a ceratopsian. Its fossils have been found in Montana.


The species assigned to this dubious genus include Dysganus encaustus, D. bicarinatus, and D. peiganus, but are all tooth taxa, based solely on teeth. A fourth species, Dysganus haydenianus, is also known, based on ceratopsian teeth. All species were described by Edward Drinker Cope in 1876. In 1907, Hatcher redescribed the teeth of Dysganus, and found that the genus was a nomen dubium. The teeth of D. peiganus were thought to be from a stegosaurian by Lull and Wright in 1942.[1]

The types of each species consist of one to eight teeth, all being detached.


Cope (1876) originally classified Dysganus in Trachodontidae, a family of hadrosaurids from the Judith River beds.[2]


The type species, D. encaustus, is known from the Judith River Formation (Cope, 1876). It lived alongside the dubious genera Palaeoscincus, Cionodon, Diclonius, and Monoclonius.[3]

See also[edit]


  1. ^ Lull, R.S. & Wright, N.E. (1942). "Hadrosaurian Dinosaurs of North America". Geological Society of America Special Papers. 40: 27–28. 
  2. ^ Stanton, T.W.; Hatcher, J.B.; Knowlton, F.H. (1905). Walcott, C.D., ed. "Geology and Paleontology of the Judith River Beds: With a Chapter on Fossil Plants". United States Geological Survey Bulletin. 8 (157): 90. 
  3. ^ Cope, E.D. (1879). Hayden, F.V., ed. "The Relations of the Horizons of Extinct Vertebrata". United States Geological and Geographical Survey. 5 (1): 37–38. 
  • E. D. Cope. 1876. Descriptions of some vertebrate remains from the Fort Union Beds of Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 28:248-261.