I want to compare skull morphology using geometric morphometrics from several 
species with different diets in a same genus. But I don't know much about how 
to analyze these shape data. What statistical analysis can I do? I know that 
principal component analysis can be done to visualize shape variations. So can 
I use the original coordinate data? Do I need to remove the effects of size and 
phylogenetic relationships to do principal component analysis? If so, do I use 
PGLS to do the regression of shape and size, and then use the obtained residual 
as the principal component analysis? In addition to this analysis, what other 
aspects can I do? Looking forward to reply.Thanks very much!

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