"Triceratops" was traditionally placed within the "short-frilled" ceratopsids but modern cladistic studies show it to be a member of the Chasmosaurinae which usually have long frills. Two species, T. horridus and T. prorsus, are considered valid today, from the seventeen species that have ever been named. Research published in 2010 concluded that the contemporaneous "Torosaurus", a ceratopsid long regarded as a separate genus, represents "Triceratops" in its mature form. This view was immediately disputed with examination of more fossil evidence needed to settle the debate.