Individual, ontogenetic, and phylogenetic variation in the dentition of hadrosaurids (Iguanodontia: Ornithischia)

Phylogenetic analyses of Hadrosauroidea are generally well-resolved, but finer resolution within Hadrosauromorpha remains contentious. This lack of resolution is due in part to the inability of discrete traits to illustrate their natural variation, particularly relating to the dental tooth battery. Not only has the variation not been properly examined, but the character definitions fluctuate throughout the literature. Here, we evaluate individual, ontogenetic, and phylogenetic variation in four fundamental tooth characters at the subfamily level to better establish their use in future analyses: number of tooth rows, tooth aspect ratio, secondary enamel ridges, and marginal enamel denticles. Factor analysis of mixed data and linear discriminant analysis were used to evaluate how accurately these four characters together identified the phylogenetic groups. We then used these data to predict phylogenetic relationships for a select few historically problematic taxa. We found that although t..., , , # Data from: Individual, ontogenetic, and phylogenetic variation in the dentition of hadrosaurids (Iguanodontia: Ornithischia)

Thomas W. Dudgeon, Gillian Gallimore, David C. Evans

The supplementary data consists of five csv files:

S1_-_Tooth_row_number.csv: The number of tooth rows (NTR) and dental battery tooth row length (DBTRL, measured in millimeters) for each specimen, and associated taxonomic data and references. Blanks for 'Ontogenetic Reference' indicate the assessment was made by us.

S2_-_Tooth_aspect_ratio_-_analogous_positions.csv: Tooth aspect ratio for analogous segments of the dentary tooth battery for each specimen, and associated taxonomic data and references. Analogous segments of the dentary tooth battery are defined in 10% increments, where teeth in the anterior 10% of tooth positions are in column '0-10%', the next 10% of tooth positions are in column '10-20%', etc. Values reported in the columns are the average tooth aspect ratios for that segment of the dental ...,