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Re: Hypsilophodon/ pachycephalosaur distribution



Adam S Smith wrote-

> What about the Chinese Chaoyangsaurus, is this
> certainly a ceratopian?

According to all phylogenetic analyses I've seen (Zhao et al., 1999; Sereno,
2001; Xu et al., 2002; Makovicky, 2002; You and Dodson, 2003), yes.
Apparently the undescribed "Xuanhuasaurus" is too.  As for the third
traditional chaoyangsaurid, "Tianchungosaurus", it's perhaps a misspelling
of the supposed heterodontosaurid Dianchungosaurus.  Impossible to say from
the literature.

Mickey Mortimer