 The maxilla of Paranthodon preserves the tooth row , and shows that there is little to no overhang . This differs from <unk> , where there is a large amount of overhang of the maxilla . The teeth also have a middle ridge , with five fewer prominent ridges on either side . This is similar to the size ridges seen on Kentrosaurus . Like all stegosaurians , the denticles on the teeth are rounded at the tips , in contrast to <unk> . Also , like Huayangosaurus , but unlike Kentrosaurus and Stegosaurus , Paranthodon possesses a prominent <unk> <unk> ( a ridge beside the tooth row ) . Paranthodon teeth preserve wear , possibly cause by rubbing with other teeth . However , wear is absent on most teeth , similar to Huayangosaurus , meaning it is likely that Paranthodon lacked <unk> between teeth . Paranthodon is distinguished from other <unk> by a long , wide , posterior process of the premaxilla , teeth in the maxilla with a very large <unk> , and large ridges on the tooth crowns . Not all of these features were considered valid in a 2008 review of Stegosauria , with the only <unk> found being the possession of a partial second bony palate on the maxilla . 
