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Re: Late night thoughts: Pathetica and Interspersal
David Marjanovic wrote:
Easy: you said there was "a dramatic increase in size that occurred early
in their evolution (from _Anchisaurus_-sized to _Isanosaurus_-sized and
beyond"; I said there was no such increase, only diversification.
So diversification entailed both a decrease and increase in size? How much
is this predicated upon the exact topology of non-eusauropod sauropodomorphs
(you know, basal sauropodomorphs, plateosaurs, basal sauropods, etc)?
I didn't mention that *Anchisaurus* comes out as the result of a dwarfing
event; the first sauropod is reconstructed as larger.
Ah, that little detail might have helped. :-)
Note that there is a possibility that _Anchisaurus_ is based on immature
Fedak, T.J., and Galton, P.M. (2007). New information on the braincase and
skull of _Anchisaurus polyzelus_ (Lower Jurassic, Connecticut, USA;
Saurischia: Sauropodomorpha): implications for sauropodomorph systematics;
pp. 245-260 in Barrett, P.M. and Batten, D.J. (eds.), Evolution and
Palaeobiology of Early Sauropodomorph Dinosaurs. Special Papers in
Palaeontology 77. Palaeontological Association, London.
(I don't actually have a pdf of this paper. If somebody could send a copy
my way, I'd be FOREVER in your debt.)
The same, incidentally, holds even for *Saturnalia* and the first
Now THAT'S a surprise.
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