Nedoceratops

Nedoceratops, which means "insufficient horned face," is a debated type of ceratopsid dinosaur that lived during the Late Cretaceous period. Scientists found it in North America, specifically in Wyoming, and it is known only from one skull.

Some paleontologists think Nedoceratops is a real and unique dinosaur, while others believe it is just a special example of Triceratops. This disagreement makes Nedoceratops an interesting subject for dinosaur experts studying the differences and connections among ancient creatures.

History of discovery

The nearly complete skull USNM 2412, the main specimen of Nedoceratops hatcheri, was found in eastern Wyoming in 1891.

The paper that described Nedoceratops was part of O. C. Marsh’s big work on Ceratopsidae. Marsh passed away before the work was finished, and John Bell Hatcher tried to complete the Triceratops section. However, Hatcher also passed away before finishing it. It was left to Richard Swann Lull to complete the work in 1905. He published Hatcher's description of the skull and named it Diceratops hatcheri, meaning "two horned face."

Later, scientists had different ideas about whether Diceratops was its own unique type or just a special example of Triceratops. In 2007, a scientist named Andrey Sergeevich Ukrainsky gave it its current name, Nedoceratops, which means "insufficient horned face." The name refers to the skull’s lack of a nasal horn.

Description

Scientists have found only one skull, called USNM 2412, that they think belongs to Nedoceratops hatcheri. At first glance, it looks like a Triceratops skull. But when you look closer, there are some differences. The brow horns on this skull stand up almost straight, unlike the brow horns on most Triceratops skulls. There are also several holes in the frill, which is different because Triceratops frills are usually solid without holes. Some of these holes might have been caused by injury or sickness. The nose horn on this skull is also smaller and more rounded than the bigger, pointy nose horns usually seen on Triceratops skulls.

Classification

Nedoceratops belonged to a group of plant-eating dinosaurs called Ceratopsia, which means "horned faces". These dinosaurs had beaks like parrots and lived in North America and Asia during the Cretaceous Period, which ended about 66 million years ago. All of these dinosaurs went extinct by the end of that time.

Some scientists think Nedoceratops might be an early form of Triceratops, or very closely related to it. There is a big debate about whether Nedoceratops, Triceratops, and another dinosaur called Torosaurus are three different kinds of dinosaurs or just different ages of the same kind. Some researchers believe that Nedoceratops was actually a young or old Triceratops, based on the shape of its bones and frill. Others disagree, saying the shape and size of Nedoceratops make it a different dinosaur.

One big difference between Nedoceratops and Triceratops is the short, rounded nasal "horn". Some scientists think this horn might have broken off while the dinosaur was alive or when it fossilized. However, dinosaur horns can vary a lot between different ages and individuals. In many other ways, like the shape of its frill and snout, Nedoceratops looks very similar to Triceratops.

Some features that seem to set Nedoceratops apart might actually be because of injuries or changes that happened to the skull after the dinosaur died. For example, some parts of the skull look different on each side, and the whole skull appears to be twisted. Also, there are many holes in the frill, which might be signs of injury or illness. Because of this, some scientists think these unusual features are not because Nedoceratops was a different kind of dinosaur, but because of things that happened after it died.