Figure 6
From: The bone microstructure of polar “hypsilophodontid” dinosaurs from Victoria, Australia
Ontogenetic trends in Victoria hypsilophodontid femora and tibiae. Flat Rocks specimens are plotted in shades of blue, and Dinosaur Cove specimens are plotted in shades of brown. CGMs found within the EFS are outlined in red. (a) For Flat Rocks and Dinosaur Cove femora in which a longitudinal growth record was quantifiable, individual age (as assessed by CGM count) is plotted against annual CGM circumference. (b) For Flat Rocks and Dinosaur Cove tibiae in which a longitudinal growth record was quantifiable, individual age (as assessed by CGM count) is plotted against annual CGM circumference. (c) The total CGM count in each Flat Rocks femur was plotted against total femur length. Tibia lengths for Flat Rocks specimens were converted to corresponding femur lengths and included on the same graph. NMV P208495 and NMV P208189 femur values directly overlap (2 CGMs, femur lengths of 13 cm). A weakly asymptotic trend emerges, with skeletally mature individuals as the oldest and largest specimens. The red bar connects the first and last CGM number within the EFS of a single specimen. (d) The total CGM count in each Dinosaur Cove femur was plotted against total femur length. Tibia lengths for Dinosaur Cove specimens were converted to corresponding femur lengths and included on the same graph. No discernible trend emerges. NMV P180892 is likely an outlier. The red bars connect the first and last CGM number within the EFS of a single specimen. (e) When the Flat Rocks and Dinosaur Cove femur datasets are plotted together, the Dinosaur Cove specimens (excluding outlier NMV P180892) plot within the range of Flat Rocks data points, contributing to the weakly asymptotic trend. The red bars connect the first and last CGM number within the EFS of a single specimen.
