Fig. 44.5.

Pulp width:tooth width (primary vertical axis) ratio and standard lengths (secondary vertical axis) of long-nosed fur seals (Arctocephalus forsteri) with previously estimated ages. Ages were estimated by analysing growth layer groups in post-canine teeth cementum. Pulp width:tooth width ratio was determined by measuring pulp width and tooth width of the left maxillary canine tooth on dental radiographs taken using the bisecting angle technique. Note that the pulp width:tooth width trend line is not statistically significant and is displayed as a guide only (K O’Connor pers. comm.). Standard length predictions for males and females are adapted from McKenzie et al. (2007), additional data K O’Connor and J McKenzie, data analysis by K O’Connor.