Re: Deinonychus eggshell and theropod egg taxonomy

["David Marjanovic" <david.marjanovic@gmx.at>]

> While it is not certain that this is conclusive evidence for brooding
> behaviour in dromaeosaurids, the discovery may have important implications
> for theropod egg taxonomy.

Yes, for me it's jumbling everything ;.-( -- so far I thought the
dinosauroid-prismatic type was primitive for theropods and just retained in
troodontids, with oviraptorosaurs + birds evolving the ornithoid type. Now
it seems like eggshells are just as prone to reversals as most other
characters. At least this makes the dinosauroid-spherulitic type (apparently
the plesiomorphy for dinosaurs) in segnosaurs less strange. If it is true:

> Dendroolithidae (Zhao & Li, 1988)(Dinosauroid-Spherulithic Basic Shell
Type)
> ; Therizinosauria, based on excellent embryonic remains discovered by the
> British Terry Manning; this assignment is disputed by Kenneth Carpenter
> (presence of premaxillary teeth, which is a credible argument).