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The dentary of the lower jaw has tall, roughly pentagonal interdental plates on the inwards side of the tooth row, and the inwards sides of these plates have a weakly pitted texture. The plates are separated from the inner wall of the dentary by a paradental groove, which is wide at the front, but narrow hind-wards by the fourth tooth socket, where the inner wall of the dentary contacts the interdental plates. The symphyseal region at the front of the dentary (where the two halves of the lower jaw connected) appears to have been much less distinct than that of Allosaurus. There are three front and upwards curving ridges on the dentary, oriented parallel to the lower surface at the front of the dentary, similar to Magnosaurus and other megalosauroids.[4] The Meckelian groove which runs along the inner surface of the dentary is inclined towards the back and downwards, and is wide and shallow. The lower margin of this groove is better defined than its upper margin, particularly in front
  of the Meckelian fossa, where it forms a sharp, convex lip. There are two Meckelian foramina in succession close to the front end of the groove, both with roughly oval outlines. The outer surface of the dentary is smooth, with about 14 neurovascular foramina randomly arranged at the front. Further back, there is a longitudinal row of slit-like foramina in a groove just above mid-height, positioned towards the bottom so they are not visible in side view.[4] The right dentary only preserves parts of the first 13 tooth sockets; comparison with Allosaurus indicates there would only have been one or two more tooth sockets, totalling 14 or 15, which is comparable to the estimate of tooth socket number in the maxilla. Emerging teeth are present in five tooth sockets, and replacement teeth are visible between the interdental plates next to four sockets. The first three tooth sockets are roughly circular, and the third is the largest of them all. The sockets behind the third are roughly rec
 tangular, and decrease in size hind-wards. By the third tooth socket, the dentary expands to the sides to accommodate the enlarged socket, as seen in Magnosaurus and megalosaurids other than Megalosaurus. The second tooth of the right dentary is the only well-preserved adult tooth from the front of a dentary known from any megalosauroid, except for the family Spinosauridae. It is longer than the teeth further behind and is circular in cross-section, consistent with the outline of its socket, and it is inclined forwards and up. Its front cutting edge extends only a short distance from the tip towards the base, while it extends just over a third of the crown height towards the base in the teeth further behind. Coelophysoids have similar front dentary teeth, and they may also be cylindrical and be inclined towards the front and upwards in other theropods with enlarged, roughly circular tooth sockets such as other megalosauroids and s