Fig 1.
Calculated range of average dental complexities for four dietary groups.
The median is represented by a horizontal line within each box and the mean is designated by the small circle. Boxes encompass the exclusive median. The range is represented by the upper and lower short horizontal lines. Individuals with an unknown diet or unknown species identification are not included. n represents the number of species included in each dietary category.
Table 1.
Information of specimens used in this study including identification, avgOPCR per tooth of all included elements, diet classification, percentage of plant material in diet, total number of teeth in specimen, and elements included in OPCR calculation.
Table 2.
Statistical analysis comparing OPCR-values between dietary categories.
Fig 2.
Observed range of dental complexity for six genera.
A) Average OPCR of upper tooth row compared to lower tooth row; B) Average OPCR of left premaxilla and maxilla compared to right premaxilla and maxilla; C) Average OPCR of left dentary compared to right dentary. Average OPCR is calculated at 25 RPT and standardized for the number of teeth included in each element. Median is represented by a horizontal line, mean is represented by a circle, and range is represented by upper and lower short horizontal lines. Boxes encompass the exclusive median.
Table 3.
Comparisons of element complexity in Ctenosaura and Amblyrhynchus using average OPCR-values of each element.
Fig 3.
Trendlines displaying the relationship between skull length and dental complexity (avgOPCR) in two genera.
A) The correlation between skull length and average OPCR for nine Amblyrhynchus cristatus specimens. B) The relationship between skull length and average OPCR for ten Ctenosaura specimens. The blue trend line includes all Ctenosaura species whereas the black trendline excludes C. hemilopha specimen.
Fig 4.
Dentigerous elements and OPCR maps of three Amblyrhynchus cristatus specimens with increasing skull length.
A) Specimen FMNH 22100 with 21.6 mm SVL; B) Specimen AMNH 31591 with 45 mm SVL; C) Specimen FMNH 15073 with 58.9 mm SVL. Increasing SVL generally corresponds to larger teeth with more defined cusps. Scale bar equals 5 mm. OPCR maps show the occlusal view of the left upper tooth row and lower tooth row.