Etymology
Contrary to popular belief, the name Monoclonius does not mean "single horn" or refer to its distinctive single nasal horn. In fact, the genus was named before it was known to have been a horned dinosaur, and had previously been considered a "hadrosaur". The name in fact means "single sprout", from Greek μόνος, monos, "single", and κλωνίον, klonion, "sprout", in reference to the way its teeth grew compared to its relative Diclonius ("double sprout"), which was named by Edward Drinker Cope in the same paper as Monoclonius. In Diclonius, Cope interpreted the fossils to show two series of teeth in use at one time (one mature set and one sprouting replacement set), while in Monoclonius, there appeared to be only one set of teeth in use as a chewing surface at any one time, with replacement teeth growing in only after mature teeth had fallen out.
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