Table 1 Binned average tooth size and body size estimates across ETM2.

Bold P values are significant and are based on bootstrapping analyses described in Materials and Methods. P values were not determined for n < 5 [not applicable (N/A)].

size (n)
Average tooth size
[ln(l × w)]
95% Confidence
Body size
estimate (kg)
Natural log (ln)
unit difference
P value% Body size change
between bins
ArenahippusPre213.630.257.70Pre to mid−0.100.016−14.3%
Post73.650.467.93Mid to post+0.080.032+20.1%
Diacodexis†‡Pre212.630.141.62Pre to mid−0.100.010−15.0%
Post42.710.571.83Mid to post+0.18N/A+32.9%
Hyopsodus§Pre232.210.180.78Pre to mid+0.010.651+1.94%
Post22.060.590.62Mid to post−0.16N/A−7.36%
Cantius‡¶Pre222.850.252.51Pre to mid−0.030.315−4.26%
Post12.772.22Mid to post−0.05N/A−7.79%

*Equal to two SDs (2σ).

†Body size calculation based on the study of Legendre (43), “artiodactyl + perissodactyl” tooth area–body size regression.

‡Post-ETM2 calculations for Diacodexis and Cantius are based on a single data point.

§Body size calculation based on the study of Damuth (44), “nonselenodont ungulates” regression.

¶Body size calculation from Gingerich et al. (74) and Legendre (43), “primate” regressions.