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In more derived forms like Lycorhinus and Heterodontosaurus, the teeth were chisel-shaped, with much higher crowns and no cingula, so that there was no difference in width between the crowns and the roots. [3] These derived cheek teeth were overlapping, so that their crowns formed a continuous surface on which food could be chewed.
The unerupted teeth are triangular in lateral view, which is the typical tooth morphology in basal ornithischians. The characteristic chisel-like shape of the fully erupted teeth therefore resulted from tooth-to-tooth contact between the dentition of the upper and lower jaws. [1] [2] [38]
When present, shovel-shaped incisors can indicate correlation among populations and are considered to be one of the non-metrical traits in osteology. Structurally resembling the shovel-shaped incisors, double shovel-shaped incisors are distinguished by a more pronounced mesial ridge compared to the distal ridge. Similarly, the grades for both ...
The incisors occupy the front of the tooth row in both upper and lower jaws. They are normally flat, chisel-shaped teeth that meet in an edge-to-edge bite. Their function is cutting, slicing, or gnawing food into manageable pieces that fit into the mouth for further chewing. The canines are immediately behind the incisors.
The shape and size of the humeral process helps to identify the species. In S. robbianus, the humeral process is about 1 + 1 ⁄ 2 to 2 times as long as it is broad, rough, and with a ridge on the lower edge. [4] The fish has three pairs of barbels. The maxillary barbels are on located on the upper jaw, and two pairs of mandibular barbels are ...
This structure contains several rows of short, chisel-shaped teeth. In S. clarias, there are relatively few premaxillary teeth arranged in one, two, or three distinct series. [4] On the lower jaw, or mandible, the teeth of Syndontis are attached to flexible, stalk-like structures and described as "s-shaped" or "hooked".
On the lower jaw, or mandible, the teeth of Syndontis are attached to flexible, stalk-like structures and described as "s-shaped" or "hooked". [2] [4] The number of teeth on the mandible is used to differentiate between species; in S. multimaculatus, there are about 30 teeth on the mandible. [5] The body color is brown, with large, darker round ...
Sinodonty is a particular pattern of teeth characterized by the following features: The upper first incisors and upper second incisors are shovel-shaped, and they are "not aligned with the other teeth". [11] The upper first premolar has one root, and the lower first molar in Sinodonts has three roots (3RM1). [11] [5]