Incremental growth of therizinosaurian dental tissues: implications for dietary transitions in Theropoda.

Few studies have investigated evolutionary trends in the dental microstructure of theropod dinosaurs within the omnivory/herbivory spectrum, primarily because: (1) most theropod taxa hypothesized to have at least a facultatively herbivorous diet ultimately evolve edentulism, rendering dental comparisons between early and late diverging members difficult to derive, and (2) early diverging species in clades that do retain teeth are generally represented by rare and highly significant specimens that cannot be destructively sampled.

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