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Jaime Headden wrote:
Recently this thread has taken a satisfying turn: discussing the species
complex for *Iguanodon.*
You betcha. I have only a few things to add.
(1) The discovery of a new North American iguanodontian from the Garden of
the Gods site, mentioned (and very briefly described) by Bakker (1998) may
help elucidate the phylogeny of _Iguandon_ and _Camptosaurus_. Or it may
complicate it even further. Time will tell. The skull doesn't appear to be
true _Iguanodon_ though, based on Bakker's illustration.
(2) Norman (1998 - the _Altirhinus_ paper) revived the genus _Cumnoria_ for
the British iguanodontian species _Camptosaurus prestwichii_, but he did not
say why he was removing it from the genus _Camptosaurus_. I think this is
interesting given Jaime's doubts regarding _C. prestwichii_'s referral to
(3) The large Australian ornithopod _Muttaburrasaurus_ Bartholomai and
Molnar 1981 seems to be increasingly secure *outside* of the Iguanodontia;
_Muttaburrasaurus_ was once regarded as a camptosaurid, or at least close to
the "thumb-spiked" iguanodontians. The alleged thumb-spike is apparently an
indeterminate bone fragment, and _Muttaburrasaurus_ appears to be more
closely related to certain Aussie hypsilophodontids.
(4) The poorly known east European ornithopod _Bihariosaurus_ Marinescu,
1989 probably has nothing useful to add to iguanodontian phylogeny. The
"diagnostic" features of this ?camptosaurid look suspiciously like juvenile
traits. If anyone can point me to a single unique character in this
specimen, please let me know.
Timothy J. Williams
Iowa State University
Ames IA 50014
Phone: 515 294 9233
Fax: 515 294 3163
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