Table 2.

External and cranial measurements (mm) of Mesechinus specimens examined; mean ± S), range for each measurement, and number of specimens measured (n) are given.

	M.orientalis sp. nov.	M.hughi	M.dauuricus	M.miodon	M.wangi
	n = 7	n = 31	n = 13	n = 18	n = 4
W	339 ± 52.97	341 ± 125.75	562 ± 124.31	505 ± 154.03	401 ± 43.27
	299–414; 3	112–750; 31	423–840; 11	230–750; 6	336–449; 4
HB	188.83 ± 8.13	189.71 ± 23.80	373.91 ± 21.35	205 ± 23.53	208.75 ± 21.90
	176–198; 6	148–232; 31	175–261; 12	120–220; 17	180–140; 4
TL	23.50 ± 3.77	19.23 ± 3.26	24.08 ± 3.50	33.22 ± 5.07	17.08 ± 1.78
	16–27; 6	12–24; 27	17–30; 12	25–43; 17	14–18; 4
HF	36.75 ± 3.19	37.97 ± 4.29	34.74 ± 7.08	58.80 ± 82.43	47.00 ± 1.12
	31–40; 6	30–47; 31	18–41; 12	35–38; 16	45–48; 4
EL	26.00 ± 2.66	22.94 ± 3.93	31.19 ± 3.28	28.81 ± 3.03	30.00 ± 1.49
	23–30; 6	16–33; 31	22–34; 11	24–35; 17	28–31; 4
GLS	49.95 ± 1.69	49.39 ± 1.54	55.18 ± 3.07	54.10 ± 2.10	54.75 ± 0.70
	47.64–51.76; 7	45.10–52.40; 23	50.20–58.40; 12	49.30–57.20; 14	53.70–55.60; 4
CBL	49.49 ± 1.64	48.46 ± 1.58	54.72 ± 2.83	53.18 ± 2.35	54.55 ± 0.59
	47.27–51.42; 7	44.40–51.20; 23	49.40–57.40; 13	48.50–56.30; 11	53.60–55.20; 4
CH	15.42 ± 0.54	16.14 ± 0.95	17.76 ± 2.00	18.67 ± 0.66	17.13 ± 0.60
	14.46–16.39; 7	14.90–18.20; 21	17.20–19.10; 9	17.80–19.70; 6	16.10–17.60; 4
BL	46.66 ± 1.45	45.55 ± 1.29	51.83 ± 1.94	49.64 ± 2.04	50.00 ± 1.37
	44.47–48.28; 7	43.20–48.80; 21	48.10–54.50; 13	44.70–52.30; 14	47.70–51.30; 4
PL	27.46 ± 0.77	26.58 ± 0.62	28.60; 1	28.82 ± 1.41	30.25 ± 0.50
	26.17–28.52; 7	25.70–28.40; 21		27.00–32.18; 14	29.50–30.80; 4
ZMB	29.62 ± 1.51	28.90 ± 1.68	32.62 ± 2.82	32.77 ± 2.09	33.97 ± 0.19
	27.78–31.41; 7	25.70–32.00; 22	28.40–36.40; 13	28.70–37.08; 14	33.70–34.10; 3
IOB	12.29 ± 0.43	12.51 ± 0.50	13.86 ± 0.68	13.87 ± 0.76	14.68 ± 0.33
	11.51–12.95; 7	11.70–13.60; 23	13.00–15.10; 9	12.90–15.10; 6	14.20–15.10; 4
MTW	24.68 ± 1.00	21.67 ± 1.57	25.58; 1	25.93 ± 1.18	25.60 ± 0.64
	23.66–26.38; 7	19.50–24.50; 21		24.30–28.30; 14	24.70–26.20; 4
GWN	3.07 ± 0.29	2.97 ± 0.29	2.96; 1	2.70 ± 0.21	4.30 ± 0.00
	2.70–3.51; 7	2.60–3.60; 23		2.37–2.94; 6	4.30–4.30; 3
BM1	19.54 ± 0.64	17.38 ± 0.75	20.20; 1	21.08 ± 0.66	21.43 ± 0.25
	19.20–20.27; 7	16.50–19.50; 21		20.30–22.30; 14	21.10–21.70; 3
LUTR	25.27 ± 0.51	24.65 ± 1.12	27.85 ± 1.25	27.25 ± 0.99	27.90 ± 1.02
	24.45–25.89; 7	21.40–26.10; 23	25.00–29; 13	25.70–29.02;14	26.70–29.10; 4
LBTR	22.32 ± 1.02	21.19 ± 0.78	24.30; 1	24.91 ± 0.70	24.85 ± 0.44
	21.31–24.16; 7	20.20–23.70; 21		23.40–25.70;14	24.20–25.30; 4