Yamaceratops (/"yah-mah-SEH-rah-tops"/; "Yama horned face") is an extinct genus of primitive ceratopsian dinosaur that lived during the Late Cretaceous period (approximately 86-83 million years ago) in what is now Mongolia. Its fossils were discovered in the Javkhlant Formation of the Gobi Desert. The genus was named and described by paleontologists Peter J. Makovicky and Mark A. Norell in 2006.

Description and Classification:

Yamaceratops belongs to the Neoceratopsia, a group within the larger Ceratopsia clade, which includes the famous Triceratops and other horned dinosaurs. Yamaceratops was a relatively small ceratopsian, reaching approximately 50 cm (1.6 feet) in length and an estimated weight of 2 kg (4.4 pounds). It possessed a short, parrot-like beak, and a primitive frill (the bony shield extending from the back of the skull) that lacked the elaborate horns and ornamentation seen in later, more derived ceratopsians.

Distinguishing Features:

Though it lacked the ornate features of its later relatives, Yamaceratops's skull does show the early development of some characteristic ceratopsian traits. It had a small frill, and its cheekbones (jugals) were moderately flared, hinting at the broader faces of later ceratopsians.

Paleoenvironment and Diet:

The Javkhlant Formation represents a semi-arid environment during the Late Cretaceous. Yamaceratops would have lived alongside other dinosaurs like the protoceratopsian Ajkaceratops. As a herbivore, Yamaceratops likely used its beak to crop tough desert vegetation such as low-growing ferns and shrubs.

Significance and Ongoing Research:

Yamaceratops represents an important early stage in the evolution of ceratopsian dinosaurs. It helps paleontologists understand the transition from small, unadorned ancestors to the large, elaborately ornamented ceratopsians of the Late Cretaceous. The small size of Yamaceratops also suggests potential ecological adaptations for living in more restrictive desert environments.


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