that do not tough the plate formed by the fusion of the processes of the sacral vertebrae. Kentrosaurus can be distinguished from other members of the Stegosauria by a number of processes of the vertebrae, which in the tail do not run sub-parallel, as in most dinosaurs. In the front third of the tail, they point backwards, the usual direction. In the middle tail, however, they are almost vertical, and further back they are hook-shaped and point obliquely forward. The chevrons, bones pointing to below from the bottom side of the tail vertebrae, have the shape of an inverted T. The scapula (shoulder blade) is sub-rectangular, with a robust blade. Though it is not always perfectly preserved, the acromion ridge is slightly smaller than in Stegosaurus. The blade is relatively straight, although it curves towards the back. There is a small bump on the back of the blade, that would have served as the base of the triceps muscle. The coracoid is sub-circular. The fore limbs were much shorter than the stocky hind limbs, which resulted in an unusual posture. The humerus (upper arm bone), like other stegosaurs, has greatly expanded proximal and distal ends that were attachment points between the coracoid and ulna-radius (forearm bones) respectively. The radius was larger than the ulna and had a wedge-shaped proximal end. The manus (hand) was small and had five toes with 2 toes bearing only a single phalange. The hindlimbs were much larger and too are similar to those of other stegosaurs. The femur (thigh bone) is the longest element in the body, with the largest known femur measuring 665 mm from the proximal to distal end. The tibia (shin bone) was wide and robust, while the fibula was skinny and thin without a greatly expanded distal end. The pes (foot) terminated in 3 toes, all of which had hoof-like unguals (claws). Armour Typically for a stegosaur, Kentrosaurus had extensive osteoderm (bony structures in the skin) covering, including small plates (probably located on the neck and anterior trunk), and spikes of various shapes. The spikes of Kentrosaurus are very elongated, with one specimen having a bone core length of 731 millimetres. The plates have a thickened section in the middle, as if they were modified spines. The spikes and plates were likely covered by horn. Aside from a few exceptions they were not found in close association with other skeletal remains.