Table 2. Copepod 18S rRNA genes used in the statistical similarity analysis.

18S rRNA genes	V regions	Lengths of V regions (bp)	Lengths of Sections (bp)	Primers pairs for Sequence amplification	Number of Sequences	Number of orders	Number of families	Number of genus	Number of species
Nearly-whole-length	V1-9	738–785	1701–1851		226	7	70	134	185
Section 1	V1-3	302–327	481–544	Euk1A [43], Euk516 [43]	320	7	76	169	265
Section 2	V4-5	291–329	537–612	Ami6F1 [24], Ami9R [24]	410	7	82	179	309
Section 3	V7	83–108	125–150	#3 [44], #4_RC [44]	300	7	79	177	284
Section 4	V8	62–68	158–165	F–P [45], R–P [45]	390	7	82	178	301
Section 5	V9	91–98	107–139	1391F [27], EukB [27]	307	7	80	172	262