Breathing
The 2011 study of the leg musculature of Poposaurus also suggested a distinctive form of respiration that involved abdominal muscles. The study hypothesized that Poposaurus had an ischiotruncus muscle running from the ischium at the back of the hip, across the pubis, and into the gastralia bones of the abdomen. In a form of respiration called cuirassal breathing, the ischiotruncus would contract and compress the trunk, pumping the lungs.
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