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Re: Egg-types and Taxonomy?
<<If the D.S. egg was the primitive dinosaur condition, the ornithoid a
derived theropod condition, and the D.P. a derived cerapod
(ornithopod + marginocephalian) condition, you would get the pattern
seen above. After all, for every character, there is a primitive state.
Anyone know what is the condition in dinosaur outgroups?>>
The D.-P. eggs are only found a few ornithopods though, most of
them have D.-S. eggs. My point was though, that in the
monophyletic saurischia arrangement one would expect more
similarities (some similarities) between sauropods and theropods'
eggs; rather than between sauropods and ornithischians' eggs. In
other words: why would a group have more in common with its
outgroup rather than its sister taxon? I'm not sure about any
thecodont or pterosaur eggs being found; on the same page they
showed croc egg structure for comparison though.