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In page Ctenosauriscus:

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A redescription of the holotype was published by Richard J. Butler, Stephen L. Brusatte, Mike Reich, Sterling J. Nesbitt, Rainer R. Schoch and Jahn J. Hornung in 2011. They did not identify any autapomorphies for Ctenosauriscus, but they noted that the holotype can be distinguished from other ctenosauriscids by a unique combination of characters. Ctenosauriscus is one of the oldest archosaurs to date, along with Vytshegdosuchus from Russia and probably Xilousuchus, a ctenosauriscid from China.[2]