An L-shaped lamina is present on the rear surface of the "apron" of the pubis. The articulation between the two halves of the ischium is characteristically close to the top of the bone, with the separated portion being only 22% the length of the bone; Ornithosuchus may have a similar condition.
An L-shaped lamina is present on the pubis's back. The connection between the ischium halves is typically near the top and consists of only 22% of the bone's length; Ornithosuchus may exhibit a comparable feature.