Table 1. Sequence characteristics of the 18S rRNA gene from 8 species in the genus Acartia, and 184 other copepod species.

Molecules	Length of Acartia (bp)	Length (bp)	GC	Nt	Nv	Nc	PI(%PI)
18S	1,689–1,787	1,694–1,742	48.5	1,878	974	854	784 (41.7)
TCs	849–869	859–862	49.1	864	258	603	178 (20.6)
CVs	829–938	834–881	47.8	1,014	716	251	606 (59.8)
V1	12–23	22–24	41.3	24	21	3	18 (75)
V2	184–214	189–213	45.9	245	178	59	149 (60.8)
V3	91–92	90–93	47.3	96	55	38	45 (46.9)
V4	213–242	219–256	45.9	286	188	70	165 (57.7)
V5	71–75	70–74	53.9	75	64	11	52 (69.3)
V7	86–141	74–93	48.0	100	68	30	57 (57)
V8	62–67	62–68	54.4	76	51	21	44 (57.9)
V9	85–97	91–98	49.4	112	91	19	76 (67.9)

18S, copepod 18S rRNA genes with the two ends trimmed (all the variable regions were intact); TCs, Total conserved region sequences in 18S; CVs, combination of all variable regions; V1-9, variable regions; GC, GC contents; Nt, total number of sites compared; Nc, total number of conserved sites; Nv, total number of variable sites; PI, parsimony-informative sites.