In the middle of the base is a large oval articular surface, the upper surface of the body of the first sacral vertebra, which is connected with the under surface of the body of the last lumbar vertebra by an intervertebral fibrocartilage.
22.
"Drusilasaura " is known from the holotype MPM-PV 2097 / 1 to 2097 / 19, a partial skeleton including four dorsal vertebrae, a sacral vertebra, six caudal vertebrae, a left scapula, dorsal rib fragments and other fragments.
23.
They are attached to the body of the first sacral vertebra and to the each ala, by short thick pedicles; on the upper surface of each pedicle is a vertebral notch, which forms the lower part of the foramen between the last lumbar and first sacral vertebrae.
24.
The laminae of the fifth sacral vertebra, and sometimes those of the fourth, do not meet at the back, resulting in a fissure known as the "'sacral hiatus "'in the posterior wall of the "'sacral canal " '.
25.
It contains a partial skull with lower jaws, three neck vertebrae, three back vertebrae, a piece of a sacral vertebra, four partial tail vertebrae, ribs, the lower end of a thighbone, the upper ends of a shinbone and calf bone, a second metatarsal and three toe phalanges.
26.
In an earlier study by Galton in 1982, it was suggested that individual difference in the sacral rib count of both " Kentrosaurus " and " Dacentrurus " might be an indication of dimorphism : females would have had an extra pair of sacral ribs, having also the first sacral vertebra connected to the ilium, in addition to the subsequent four sacrals.
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