The pelvis of pterosaurs was of moderate size compared to the body as a whole.
Often the three pelvic bones were fused.
The ilium was long and low, its front and rear blades projecting horizontally beyond the edges of the lower pelvic bones.
Despite this length, the rod-like form of these processes indicates that the hindlimb muscles attached to them were limited in strength.
The, in side view narrow, pubic bone fused with the broad ischium into an ischiopubic blade.
Sometimes, the blades of both sides were also fused, closing the pelvis from below and forming the pelvic canal.
The hip joint was not perforated and allowed considerable mobility to the leg.
It was directed obliquely upwards, preventing a perfectly vertical position of the leg.

The front of the pubic bones articulated with a unique structure, the paired prepubic bones.
Together these formed a cusp covering the rear belly, between the pelvis and the belly ribs.
The vertical mobility of this element suggests a function in breathing, compensating the relative rigidity of the chest cavity.
The pelvis of pterosaurs was of moderate size compared to the body as a whole. Often the three pelvic bones were fused. The ilium was long and low, its front and rear blades projecting horizontally beyond the edges of the lower pelvic bones. Despite this length, the rod-like form of these processes indicates that the hindlimb muscles attached to them were limited in strength. The, in side view narrow, pubic bone fused with the broad ischium into an ischiopubic blade. Sometimes, the blades of both sides were also fused, closing the pelvis from below and forming the pelvic canal. The hip joint was not perforated and allowed considerable mobility to the leg. It was directed obliquely upwards, preventing a perfectly vertical position of the leg.
The front of the pubic bones articulated with a unique structure, the paired prepubic bones. Together these formed a cusp covering the rear belly, between the pelvis and the belly ribs. The vertical mobility of this element suggests a function in breathing, compensating the relative rigidity of the chest cavity.
Pterosaur