Homo Naledi Had Wear-Resistant Molars, Ancestor Chewed a Lot of Dirt and Grit
Homo naledi’s relatively taller and more wear resistant molars enabled it to have a much more abrasive diet than other South African hominins. This is the result of a recent study by researchers from the Max Planck Institute for Evolutionary Anthropology in Leipzig, the University of Durham in the United Kingdom and the University of Arkansas in the United States. The researchers conclude that Homo naledi may have eaten a much grittier diet than other South African hominins.
© MPI f. Evolutionary Anthropology
Mammals that eat foods that need to be cut, like leaves and grasses, have sharper, more complex molars (i.e. more cusps and crests) , while mammals that eat foods that need to be crushed, like fruits and nuts, have duller, less complex molars. The researchers used a technique known as dental topography to measure molar sharpness, complexity, and other aspects of tooth shape in South African hominins to reconstruct the diet of Homo naledi.
The researchers found no difference in sharpness or complexity between the molars of Homo naledi and other South African hominins, implying they ate foods with similar mechanical properties. However, Homo naledi did have relatively taller, more wear resistant molars than other South African hominins, suggesting its teeth were adapted to consume foods that wore its teeth faster. “We think that Homo naledi must have been eating foods covered in dust or grit, or possibly ate plants containing lots of defensive silica particles, known as phytoliths”, said Michael Berthaume of the Max Planck Institute of Evolutionary Anthropology and Durham University, one of the authors of the study.
Plants produce phytoliths or ‘plant stones’ to try and prevent animals from eating too much of them. Animals such as grass-eating antelopes living in dry, and hence gritty, environments have high crowned molars to enable them to eat diets heavy in plant stones and grit without wearing their teeth away too much.
A reconstruction of Homo naledi’s head by paleoartist John Gurche, who spent some 700 hours recreating the head from bone scans. (from the October issue of National Geographic magazine)
Contacts and sources:
Dr. Michael Berthaume
Max Planck Institute for Evolutionary
Source: http://www.ineffableisland.com/2018/03/homo-naledi-had-wear-resistant-molars.html
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