Scelidosaurus still had the five pairs of fenestrae (skull openings) seen in basal ornithischians: apart from the nostrils and eye sockets which are present in all basal dinosaurs, the fenestra antorbitalis and the upper and lower temporal fenestrae were not closed or overgrown, as with many later armoured forms. (wikipedia.org)
The evolution of longirostrine morphology and a bulbous anterior rosette of premaxillary teeth also occurs in the spinosaurid theropod dinosaurs, leading to suggestions that at least some members of this clade also had a diet comprising a notable proportion of fish or other small vertebrates. (fr.gd)
Jaws5
In fact, the upper temporal fenestrae were very large, forming conspicuous round openings in the top of the rear skull, serving as attachment areas for the powerful muscles that closed the lower jaws. (wikipedia.org)
Protoceratops , like many other ceratopsians, were herbivores equipped with prominent jaws and teeth suited for chopping foliage and other plant material. (wikipedia.org)
Here, we present a new sphenodontian species from the Early Jurassic of North America (Arizona, USA) represented by a nearly complete articulated skeleton and dozens of upper and lower jaws forming the most complete ontogenetic series in the sphenodontian fossil record. (nature.com)
A considerable portion of sphenodontian fossil diversity is represented only by fragmentary specimens of little systematic value, such as isolated jaws and teeth-e.g., refs. (nature.com)
1970) suggested that the addition of larger teeth at the rear of the dental rows in monophyodont lizards would be a way to maintain appropriate sized teeth in continuously growing jaws. (researchgate.net)
Ontogenetic2
Our analysis of 32 specimens has shown a pattern of ontogenetic tooth loss through the reduction of overall tooth counts from 13 to 10 tooth positions (Fig. 1I). (researchgate.net)
The ontogenetic reduction in tooth count in Opisthodontosaurus is difficult to quantify statistically because most of the dentaries are incomplete, making jaw length an ineffective metric by which to approximate size or age of the individual. (researchgate.net)
Attachment3
Tooth implantation should not be conflated with tooth attachment which refers to the tissue that attaches the tooth to the dentulous bone. (researchgate.net)
Tooth implantation has been conflated with other tooth characteristics, such as replacement, attachment, and morphology. (researchgate.net)
Tooth attachment refers to the tissues that attach teeth, whilst implantation refers to the orientation of the tooth relative to the jaw. (researchgate.net)
Positions1
Acharacter combination of at least 28 dentary tooth positions in a dentary with one active crown and one replacement tooth for each position and non-parallel alveolar septa. (plazi.org)
Ridge1
The antorbital fenestra is present as a bean-shaped depression, its lower edge formed by a sharp ridge. (wikipedia.org)
Present1
Scelidosaurus still had the five pairs of fenestrae (skull openings) seen in basal ornithischians: apart from the nostrils and eye sockets which are present in all basal dinosaurs, the fenestra antorbitalis and the upper and lower temporal fenestrae were not closed or overgrown, as with many later armoured forms. (wikipedia.org)
Replacement1
Reptilian dentitions tend to be homodont (Montanucci, 1968) readily masking any external anatomical evidence of a change in tooth position that would be associated with tooth replacement, as the new tooth would look very similar in size and shape to its predecessor. (researchgate.net)
Upper1
P. andrewsi had a pair of cylindrical, blunt teeth near the tip of the upper jaw. (wikipedia.org)
Size1
2002), an identification which would be consistent with the small size of these teeth. (blogspot.com)
Side1
The skull was low in side view and triangular in top view, longer than it was wide, similar to that of earlier ornithischians. (wikipedia.org)