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Re: Long-necked stegosaur, head tail mimicry?
Tim Williams writes:
> > I should think so! It would be disastrous to resurrect that name
> > to denote a completely different clade from the one that it has
> > been universally understood to mean.
> Mike, I disagree completely and utterly with you here. Now that
> I've gotten that out of the way, here's why...
I'm not going to get sucked into this. Happily, Upchurch and Wilson
agree with me.
> > At least FOUR times -- in Mamenchisauridae, Diplodocidae (the
> > neck of Supersaurus is best estimated at 15m, longer than any
> > other), Brachiosauridae sensu stricto and once or more within the
> > huge, ill-defined cloud that is Titanosauria.
> True. But I was referring specifically to the anatomical trait of
> increasing neck length by wholesale recruitment of dorsals into the
> cervical column. As you know, diplodocids and brachiosaurids
> lengthen the neck principally by elongation of pre-existing
> cervicals. _Euhelopus_ and mamenchisaurids go one better, and add
> extra vertebrae into the neck, at the expense of the anterior
> dorsals. The stegosaur _Miragaia_ does this too - which
> incidentally is how this thread originally started.
As does Barosaurus -- see McIntosh's (2005) article in Thunder Lizards.
/o ) \/ Mike Taylor <firstname.lastname@example.org> http://www.miketaylor.org.uk
)_v__/\ "I do not even own _a_ gun; let alone _many_ guns, that would
necessitate an entire rack" -- Mike Myers, "Wayne's World"