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The former lies just back of the head, in the region of the fore legs, and consists of four larger and a number of smaller plates. The latter, or dorsal shield, extends over the back in fairly regular longitudinal rows and quite regular transverse rows. At the widest part of the trunk there are six or eight of these scutes in one transverse row.
These cranial osteoderms are comparable to the ones on the body. Typically lizards have 2 longitudinal rows that include large medial and smaller lateral plates. These plates extend down the neck, trunk and tail. Over time, horizontal rows develop under the body that include small lateral plates that can connect the ventral and dorsal osteoderms.
Susisuchus has a dorsal shield of osteoderms that is similar to those of the more derived clade Eusuchia, which includes living crocodilians. Susisuchus was one of the first mesoeucrocodylians to have a tetraserial paravertebral shield, which is formed from the dorsal osteoderms to make the back more rigid. In a tetraserial paravertebral shield ...
The upper jaw extends markedly further forward than the lower jaw. Four premaxillary and 14 to 15 maxillary teeth are on either side of the upper jaw and 21 or 22 teeth on each side of the lower jaw, giving a total of about 80 teeth. The neck is relatively slender and the dorsal scutes are less prominent than in the smooth-fronted caiman. The ...
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). To either side of the shield, there are four rows of accessory parasagittal osteoderms. These accessory osteoderms tightly interlock with one another. [8]
Armour, although all used for the sole intent to ward off attackers, can be split into defensive and offensive armour. Examples of offensive armour are horns, hooves, antlers, claws, beaks, clubs and pincers, as developed in some mammals, birds, reptiles (including dinosaurs, such as the dromaeosaurid claw and the ceratopsian horn) and arthropods.
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A. clavatus is the type species, and is known from distinctive fragments found in the Frasnian-aged Huron and Olentangy Shales of Ohio.It has a "gently folded" median dorsal plate, and has a low crest placed on the posterior end of the median dorsal's midline.