Koreaceratops is notable for the tall neural spines on its caudal vertebrae, and for the structure of its astragalus. In some of the distal caudal vertebrae, the neural spines are over five times the height of the vertebral centra to which they attach. Lee et al. noted that several other ceratopsians also had tall neural spines on their caudals. As this trait appears in several branches of ceratopsians, Lee et al. postulated that the feature was independently evolved, perhaps as an adaptation for swimming. Lee et al. performed a phylogenetic analysis and found Koreaceratops to be positioned between Archaeoceratops and more derived ceratopsians.
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