Abstract:
The degree of maxillary molar tooth-row eruption and wear were used to assign samples of the
social giant mole-rat, Fukomys mechowii, from Zambia, into nine relative age classes in order
to assess ontogenetic (age) variation and craniometric sexual dimorphism, with reference to
body mass. Univariate and multivariate statistical analyses showed craniometric differences
between age classes 1–3 and age classes 5–9, with age class 4 being intermediate between
these two age class groupings. This suggests that age class 4 lies at a point on a hypothetical
growth curve where growth begins to stabilize. The intermediate placement of age class 4
in multivariate space broadly coincided with body mass categorizations into juveniles
(age classes 1–3; <100 g), subadults (age class 4; c. 100–150 g), and adults (age classes 5–9;
>150 g). The analyses also revealed the absence of sexual dimorphism in the relatively younger
age classes 1–4 but its presence in the relatively older age classes 5–9, and these results are
supported by data on body mass. These results may have implications in our understanding of
the population and social structures, and reproductive strategies in this little-studied giant
mole-rat.
