D. encaustus Cope, 1876
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.
The types of each species consist of one to eight teeth, all being detached.
- Lull, R.S. & Wright, N.E. (1942). "Hadrosaurian Dinosaurs of North America". Geological Society of America Special Papers. 40: 27–28.
- 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.
- 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.
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