Table 3 Nucleotide composition of the mitogenomes of four Neritidae species.

Region	Size (bp)		A (%)		T (%)		G (%)		C (%)
Region	Co	Cs	Co	Cs	Co	Cs	Co	Cs	Co	Cs
Mitogenome	15,706	15,919	31.46	33.79	34.34	30.67	19.11	15.24	15.08	20.30
cox1	1548	1548	23.51	22.55	40.44	39.66	21.19	22.22	14.86	15.57
cox2	690	690	27.25	27.25	36.38	36.38	21.01	21.16	15.36	15.22
atp8	165	165	29.09	28.48	40.61	42.42	19.39	19.39	10.91	9.70
atp6	702	699	23.08	22.46	41.74	41.06	19.52	20.46	15.67	16.02
cox3	780	780	21.41	20.77	40.51	39.23	22.18	23.97	15.90	16.03
nad3	354	354	21.75	18.64	43.22	43.50	23.73	26.27	11.02	11.58
nad1	933	933	27.76	26.05	37.41	36.76	16.29	17.15	18.54	20.04
nad5	1716	1717	28.96	28.65	35.96	33.84	14.28	14.85	20.80	22.66
nad4	1323	1254	27.97	27.43	38.10	37.16	14.36	14.59	19.58	20.81
nad4l	294	294	28.57	29.59	35.71	36.05	17.69	17.01	18.03	17.35
nad6	501	507	27.15	25.05	43.51	40.04	13.77	15.98	15.57	18.93
cob	1137	1137	26.47	26.47	37.03	36.94	15.57	15.30	20.93	21.28
nad2	1003	999	24.03	24.02	41.48	41.14	22.23	23.22	12.26	11.61
tRNAs	1481	1485	30.79	31.18	32.14	32.26	21.74	20.94	15.33	15.62
rRNAs	2193	2196	36.62	36.57	31.19	30.51	17.10	17.12	15.09	15.80
PCGs	11,146	11,077	25.96	25.30	38.90	38.02	18.01	18.78	17.12	17.89

Region	Size (bp)		A (%)		T (%)		G (%)		C (%)
Region	Nc	Nj	Nc	Nj	Nc	Nj	Nc	Nj	Nc	Nj
Mitogenome	15,716	15,875	30.40	29.81	35.36	35.35	20.53	21.18	13.71	13.66
cox1	1548	1548	22.55	20.93	41.02	40.89	21.90	23.64	14.53	14.53
cox2	690	690	26.09	25.22	36.81	37.68	23.62	23.62	13.48	13.48
atp8	165	165	27.27	27.88	39.39	39.39	21.82	21.82	11.52	10.91
atp6	699	699	22.03	19.60	43.63	44.06	19.74	21.60	14.59	14.74
cox3	780	780	19.87	21.03	42.05	40.26	23.08	23.85	15.00	14.87
nad3	354	354	19.21	18.08	46.61	46.05	25.14	27.40	9.04	8.47
nad1	933	933	29.26	29.26	35.37	33.55	15.22	14.68	20.15	22.51
nad5	1686	1665	31.55	31.83	33.93	33.03	12.51	12.97	22.00	22.16
nad4	1296	1254	29.55	30.14	37.65	35.73	12.27	12.60	20.52	21.53
nad4l	294	294	33.67	32.65	32.65	33.33	14.29	15.31	19.39	18.71
nad6	507	507	30.37	29.19	40.04	40.04	11.44	13.02	18.15	17.75
cob	1137	1137	27.70	28.41	36.24	36.50	14.60	14.86	21.46	20.23
nad2	1003	1101	22.13	21.44	41.08	42.96	25.32	25.70	11.47	9.90
tRNAs	1485	1495	31.52	30.90	31.92	32.24	21.48	21.54	15.08	15.32
rRNAs	2204	2239	35.66	36.62	30.90	30.15	16.11	15.72	17.33	17.51
PCGs	11,092	11,127	26.41	25.82	38.45	38.73	17.82	19.31	17.32	16.14

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