In a message dated 6/30/03 8:31:52 PM Pacific Daylight Time, bh480@scn.org writes: << However, Heterodontosaurus is found to be the sister taxon to Marginocephalia, rather than a basal Ornithopoda. >> About time. I published this notion way back in MM #2, 1991, and it goes back at least to Zhao Xijin's infamous Acta Pal Polonica paper of 1983.