Re: Coelurus a maniraptoran (for how long?)

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

> Segnosaur eggs are dendroolithid, as shown by a recent abstract on
embryonic
> segnosaur parabasicranial morphology.  More on that later tonight....  I
> don't see why eggshell morphology couldn't have reversed as easily as any
> other morphological character, so I don't think this is a blow to their
> status as coelurosaurians.
>
> Mickey Mortimer

Why should it have reversed? What evolutionary pressures are there at all
that can trigger the evolution of new eggshell types? ~:-| ~:-|