Rugosity and cheek question for reconstructions

["Demetrios M. Vital" <vita0015@umn.edu>]

Hello all,

Two queries:

1.  Thanks to a HP Tracy Ford, I am convinced that theropods have no lips,
and have appropriately adjusted that in my reconstructions, but I am unsure
as to the nature of lips and cheeks in marginocephalians, specifically for
my Stygimoloch drawing.  I want to put cheeks, based off of photos of the
skull, but I remember a recent issue over cheeks, a year ago or so.  Pardon
me for flogging a possibly dead horse, but is there a consensus about
cheeks in these animals?

2.  Many theropods have rugosities all over their skulls for possible
keratinous growths (I don't know what a better term would be), like the
brow hornlets, nasal rugosities, etc.  I also know that keratin would
extend the length of claws by one-third their length in the form of horny
sheaths.  But is there an analysis of how much keratin would form on
cranial rugosities of varying rugose-ness (I don't think I've ever used the
word "rugose" this much in a paragraph before), so that illustrators know
how big to make the rugosities?

Thanks in advance for any answers, on- or offlist.

-Demetrios Vital