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In dinosaurs, the anatomy of the braincase is conservative, but for this reason can be used to infer relationships of a group when other skeletal features underwent changes so profound that their origins can no longer be traced. The braincase may also allow for reconstructing the brain and inner ear, with inferences on senses and intelligence. [20]
Cross section of a typical theropod dinosaur tooth in side view. All dinosaur teeth possess the same tissue types but can differ in their appearance. Various major groups of dinosaurs have been examined through histology, these include the carnivorous theropods and herbivorous groups such as the sauropods, hadrosaurs and ceratopsians.
Dimetrodon (/ d aɪ ˈ m iː t r ə ˌ d ɒ n / ⓘ [1] or / d aɪ ˈ m ɛ t r ə ˌ d ɒ n /; [2] lit. ' two measures of teeth ') is an extinct genus of sphenacodontid synapsid tetrapods that lived during the Cisuralian age of the Early Permian period, around 295–272 million years ago.
The German specimen also shows a diastema (tooth gap) behind the first three teeth of the premaxilla. [5] As such a gap was not present in the French specimen, Peyer suggested that additional teeth were possibly present in this region the German specimen. [16] The number of digits on the hand of Compsognathus has been a source of debate. [29]
Reisz developed this hypothesis by studying dental anatomy and living relatives of dinosaurs. Lips protect teeth from drying out and they help preserve the enamel.
Estimations of the tooth count of Carcharodontosaurus vary, but a recent estimate of 30 dentary, 8 premaxillary, and 24 maxillary teeth for a total of 62 teeth was made. [56] Carcharodontosaurid teeth are some of the largest of any dinosaur group, with a maxillary tooth from SNSB-BSPG 1922 X 46 being 6.8 centimetres (2.7 in) tall and 3.5 ...
Isolated teeth in the Hell Creek are common enough to be dug commercially by collectors, but rare enough that they are often sold for very high prices with fragmentary teeth usually beginning at least in the hundreds of USD, and complete teeth in the thousands of USD. Perhaps the best known iconic dinosaur. Nanotyrannus? [8] [38] N.lancensis [8 ...
The teeth were packed into a single row that created a shearing surface. Both dentary and maxillary teeth presented marked homodonty—a dental condition where the teeth share a similar shape and size. P. andrewsi bore two small, peg to spike-like teeth that were located on the underside of each premaxilla. The second premaxillary tooth was ...