Occipital condyle width (OCW) is a highly accurate predictor of body mass in therian mammals

Table 10 Body mass estimates (in kg) and 95% confidence interval for Hyaenodon spp. in this study, compared to estimates in previous studies

Hyaenodon horridus			Hyaenodon crucians
Mean	Lower	Upper	Mean	Lower	Upper	Measurement	Reference
32.2	14.9	69.3	13.0	6.0	27.9	OCW (all taxa)	Present Study
31.5	15.9	62.4	12.6	6.4	24.9	OCW (all taxa with condyle shape)	Present study
34.1	19.0	61.2	12.4	6.9	22.1	OCW (Carnivora-only)	Present Study
30.2	12.9	71.0	8.8	3.8	20.7	HBL	[39, 167]
130.6	47.5	359.3	30.5	11.2	83.2	Skull length	[39, 167]
38.4	28.1	52.6	–	–	–	Humeral trochlea area	[168]
41.4	24.9	43.3	15.0	9.1	24.8	“Limb bones”	[32]
25.8	12.8	51.8	10.6	5.3	21.3	Li1 (Astragalus)	[58]
29.2	13.9	61.1	11.0	5.3	23.1	Ar1 (Astragalus)	[58]

The equations of Morlo [78] were not used because this study estimated body mass in hyaenodonts by regressing molar row/average molar length against body mass estimates created using other proxies (done at least in part to avoid the issue of hyaenodonts having large heads), rather than directly estimating body mass from skeletal proxies in a sample of living taxa. The measurement from Egi [32] is listed as “limb bones” because Egi [32] does not detail which of the equations they produced were used to estimate the reported body mass. Note that body mass estimates reported here are not all drawn from the same individuals

ISSN: 1741-7007