The Tatankaceratops type specimen was pieced together from partial remains before it was named in 2010, and soon after there were murmurings that it was actually a juvenile Triceratops. This stems down to a 2011 study by Nicholas R. Longrich which noted a mix of juvenile and adult characteristics in the skull. Since this time other palaeontologists have expressed their suspicions about Tatankaceratops with the two main theories being that it is either a juvenile Triceratops or one that has a growth defect that stunted its development.
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