Қазба динозаврлар туысы - Дисганус

Extinct genus of dinosaurs

Dysganus (dis GANN us) (meaning "rough enamel") is a dubious genus of ceratopsian dinosaur from the Campanian stage of the Late Cretaceous. The fossil teeth referred to Dysganus were first collected by Charles Sternberg from the Cretaceous Judith River Formation of Montana and later described by Edward Drinker Cope. All of the species are now seen as dubious Ceratopsians,

The generic name Dysganus is derived from the Greek roots dys meaning “bad” and ganos for tooth enamel, the full name meaning “rough enamel”. The specific name for the type species, D. encaustus, means “burnt in” based on the concave tooth tip. The other species named by Cope have several meanings. D. bicarinatus means “two keels” after the 2 keels running down the length of the type teeth. D. haydenianus was named after American paleontologist and biologist Ferdinand V. Hayden. stegosaurid, or hypsilophodontid, but it is actually an unworn Ceratopsian tooth. In 1901, Franz Nopcsa von Felső Szilvás assigned Dysganus to the Ceratopsia, either by reading Cope's original descriptions of the genus or by Cope in 1890 indirectly suggesting that Dysganus was a ceratopsian rather than a "trachodontid". Later in 1907, Hatcher et al. republished Cope's original descriptions of Dysganus in their entirety and deduced that the holotype of D. encaustus included teeth of hadrosaurids (then trachodontids), and the teeth of ceratopsids. The teeth of D. peiganus were thought to be from a stegosaurian by Lull and Wright in 1942.