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Tuesday 13 December 2022 10:14am

Analysis of teeth of extinct lemurs has revealed fascinating clues to the evolution of humans, a University of Otago study has found.

Dr Ian Towle imageDr Ian Towle.

Lead author Dr Ian Towle, of the Sir John Walsh Research Institute in the Faculty of Dentistry, says the “surprisingly large” monkey lemur, Archaeolemur, had novel anatomical features not seen in living lemurs, such as lacking a 'tooth comb' in the front of the mouth for grooming.

“These extinct lemurs are so different to those alive today. They also show fascinating similarities to monkeys and apes, including humans,” he says.

The study, published in the American Journal of Biological Anthropology, aimed to assess the diet of Archaeolemur by analysing chipping in 447 teeth, comparing chipping frequencies to those of other primates.

The results were surprising – with these remarkable extinct lemurs with dentitions resembling baboons in shape; but presenting tooth chipping patterns similar to fossil hominins such as Neanderthals.

Archaeolemur skull imageArchaeolemur skull showing a large and robust anterior dentition.

Archaeolemur tooth chipping patterns are unlike any living primate, with their front teeth showing substantial fractures, often with numerous tooth chips on a single tooth, yet very little chipping on their back teeth.

“Similar tooth fracture patterns are observed in fossil hominins, such as Neanderthals. Typically, in Neanderthals these fracture patterns are thought to be related to tool-use behaviours,” Dr Towle says.

The results fit with previous research on Archaeolemur, in particular evidence that their large and robust front teeth may have been used to process a diet containing hard and tough foods.

Dr Towle thinks the study raises the “fascinating possibility” that stone tools do not necessarily explain the high rate of fractures on Neanderthal teeth.

Archaeolemur shows similar tooth chipping patterns, yet there is no evidence to suggest they were capable of, or used, such tools.

“Studying extinct primates not only provides crucial insight into their diet and behaviour, but also elucidates our own evolutionary history.”

Given the overlap in skull and dental shape, and potential similarities in diet and behaviour, it is perhaps not surprising that Archaeolemur was thought to be an ape when first discovered in Madagascar over 100 years ago.

Archaeolemur is a brilliant example of convergent evolution, showing remarkable similarities to monkeys and apes. This species also highlights the extent to which lemurs in Madagascar diversified into a variety of ecological niches.”

Dr Carolina Loch, also from Sir John Walsh Research Institute, and who mentored Dr Towle during his tenure as postdoctoral fellow at the SJWRI, says the research is another great example of the “breadth and depth of multidisciplinary research” at the Faculty of Dentistry.

Publication details

Tooth chipping patterns in Archaeolemur provide insight into diet and behavior

Ian Towle, Paul J. Constantino, Matthew R. Borths, Carolina Loch

American Journal of Biological Anthropology

DOI: 10.1002/ajpa.24674

More information

Dr Ian Towle
Sir John Walsh Research Institute
Faculty of Dentistry
University of Otago
Email (Ian is in the UK, please make initial contact via email)

Ellie Rowley
Communications Adviser
University of Otago
Mob 021 278 8200

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