Ceratopsian Month #04 – Auroraceratops rugosus

An illustration of the extinct early ceratopsian Auroraceratops. It has a triangular head with a beak and cheek horns, short arms, bird-like legs, and a tapering tail. it's depicted with a speculative coat of fluffy fur-like protofeathers over the upper parts of its body, colored brown with darker spots over its back and a darker head.

Auroraceratops (“dawn horned face”) lived during the Early Cretaceous of China (~130-100 mya). Around 2m long (6′6″), it had a shorter and wider snout than other early ceratopsians, with a more flattened broader head shape.

It was closely related to other small Asian species like Koreaceratops, and was probably primarily bipedal due to its proportionally short arms. But, since it falls at a transitional point in ceratopsian evolution between bipedal ancestors and quadrupedal later forms, it may have adopted a four-legged posture while feeding or moving at slow speeds.

Its skull had several patches of thickened bone, found directly in front of its eyes and on its lower jaw. These could have had some visible tough keratinous coverings in life – although I’ve not depicted any here – and could potentially have been used for pushing and butting during fights.

The back of its small frill shows evidence of attachment sites for its jaw muscles, suggesting that ceratopsian frills may have originally evolved to support large powerful chewing muscles before being secondarily modified into elaborate display structures.

Leave a Reply

Your email address will not be published. Required fields are marked *