A team of Swedish scientists have described the earliest known example of dentary bone with two rows of cusps on molars and double-rooted teeth.
The new findings—published in PNAS—offer insight into mammal tooth evolution, particularly the development of double-rooted teeth.
The first mammals originated in the latest Triassic period, around 205 million years ago. An ancestor to mammals were the therapsids, ‘mammal-like reptiles’ referred to as stem mammals or proto-mammals, which originated about 320-300 million years ago.
One unique characteristic of the lineage that included mammals and animals related to mammals (synapsids) was that they developed complex occlusion. Close ancestors to mammals, called mammaliaforms, developed rows of cusps on molar-like teeth adapted for more omnivorous feeding. The origin of this multicusped pattern and double-rooted tooth has thus far remained unclear.
A team of scientists from Uppsala University have investigated the jaw anatomy and tooth structure of a recently described new mammaliaform species named Kalaallitkigun jenkinsi. It was discovered on the eastern coast of Greenland and was a very small, shrew-like animal, probably covered with fur. It would have been the size of a large mouse and lived during the Late Triassic, around 215 million years ago.
Kalaallitkigun jenkinsi exhibits the earliest known dentary with two rows of cusps on molars and double-rooted teeth. The anatomical features place Kalaallitkigun jenkinsi as an intermediate between the mammals and the insectivorous morganucodontans, another type of mammaliaform.
The researchers believe that the structural changes in the teeth are related to changed feeding habits. In this case study, the animals were switching to a more omnivorous/herbivorous diet and the tooth crown was expanding laterally. Broader teeth with ‘basins’ on the top surface are better for grinding food. This development also forced changes in the structure of the base of the tooth.
The biomechanical analysis that was carried out within the study found that multi-rooted teeth are better able to withstand mechanical stresses, including those of upper and lower tooth contact during biting, compared to single-rooted teeth. Human teeth, for instance, have this characteristic.
The results suggest that the development of molar-like teeth with complex crowns may have developed together with biomechanically optimised dual roots.