(Walters, 1996)

Achelousaurus: Decribed by Sampson in 1995. This Ceratopsian has been referred to as a proto-pachyrhinosaur, with an incipient nasal boss (Dodson,1996). It has two large spikes on the frill and adults have lumpy mounds for both brow and nose horns. It is from north-central Montana (Dodson, 1996).

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