Table 1. Measurements (mm) of upper teeth (P4-M2) and postcranial remains (humerus and radius) of St Bathans Early Miocene mystacinids (bold) compared with summary statistics for those elements in New Zealand Quaternary Mystacina species and Australian Oligo–Miocene Icarops species.

Taxon		P4L	P4W	M1L	M1W	M2L	M2W	HPW	HDW	RPW
† Mystacina miocenalis				2.97	2.8	2.78	2.94
†Mystacinid indet. 1		1.55	1.75					4.35	2.15	2.65
†Mystacinid indet. 2		1.25	1.45						2.7
Mystacina tuberculata	min.	1.18	1.19	1.65	1.45	1.65	1.6	3.76	3.1	2.46
	max.	1.34	1.48	1.9	1.7	1.85	1.85	4.19	3.65	2.8
Mystacina robusta (E)	min.	1.69	1.81	1.9	1.9	1.9	2.0	4.65	3.76	3.04
	max.			2.37	2.25	2.2	2.4	4.83	4.3	3.22
M. robusta (Waitomo)	min.			2.1	2.0	2.1	2.2	4.4	4.1	2.84
	max.			2.5	2.6	2.5	2.6	4.8	4.5	3.33
† Icarops paradox	min.	0.9	1.1	1.3	1.5	1.3	1.7
	max.	1.1	1.2	1.5	1.6	1.5	1.8
† Icarops aenae	min.			1.9	1.9				3.15
	max.			2.0	2.1

Measurements of New Zealand Quaternary Mystacina species from Worthy et al. [32], Worthy and Scofield [33] and this study; those of Australian Oligo–Miocene Icarops species are from Hand et al. [6, 14]. Mystacina robusta (E) is from Stewart Island area [33]; M. robusta (Waitomo) is from Waitomo and Hawkes Bay, North Island, where this species is largest [32]. Abbreviations: D, distal; H, humerus; L, length; P, proximal; P4, posterior upper premolar; M1, first upper molar; M2, second upper molar; max., largest specimen in sample; min., smallest specimen in sample; R, radius; W, width;

^†, extinct.