Osteoderms covering the back, tail, and limbs are light and porous, while the osteoderms covering the belly are plate-like and have an inner structure resembling spongy diploë. Simosuchus has a tetraserial paravertebral shield over its back, meaning that there are four rows of tightly locking paramedial osteoderms (osteoderms to either side of the midline of the back).
The osteoderms covering the back, tail, and limbs are lightweight and porous, while those on the belly are plate-like with an inner structure similar to spongy diploë. Simosuchus has a tetraserial paravertebral shield over its back, indicating four rows of tightly interlocking paramedial osteoderms (osteoderms aligned alongside the midline).