image: This isa mesowear "ruler" developed for scoring dental mesowear on fossil equids, consisting of seven Equus cusp apices cast onto an epoxy surface. The "ruler" is used by matching the cusp apex of a fossil specimen to one of the seven reference cusps and assigning it a score of 0–6. This image relates to an article that appeared in the March 4, 2011, issue of Science, published by AAAS. The study, by Dr. Matthew Mihlbachler, at the New York College of Osteopathic Medicine in Old Westbury, N.Y., and the American Museum of Natural History in New York, N.Y., and colleagues was titled, "Dietary Change and Evolution of Horses in North America." view more
Credit: Image courtesy of Matthew Mihlbachler