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Proportion of torso devoted to pelvis query

Was wondering if there are any studies detailing ratio of torso/pelvis?

Was also wondering what the consensus is regarding number of sacrals captured 
in terrestrial species? Two is basal for amniotes. What does it mean when 
three, four, five, seven and ten are incorporated? 

I've always figured more captured sacrals are a phylogenetic response to 
strengthening an area prone to stress and strain. Any other hypotheses? Of 
course, snakes and whales represent the opposite end of the continuum.
David Peters