Table II. – AfriBasin size, species and endemics per AfriBasin and different proxies of sampling effort based on 42022 georeferenced records from the RMCA fish collection and GBIF.

Subbasin	Size (km 2)	Species	Species / 1000 km 2	Endemics	Endemics / 1000 km 2	Records	Records / 1000 km 2	Sampling localities	Sampling loc. / 1000 km 2	Sampling days	Sampling days / 1000 km 2	Expeditions	Expeditions / 1000 km 2
Middle Congo	75000	344	4.59	3	0.04	3622	48.29	172	2.29	495	6.60	154	2.05
Kasai	290000	259	0.89	23	0.08	1630	5.62	121	0.42	239	0.82	138	0.48
Pool Malebo	9500	254	26.74	10	1.05	4455	468.95	101	10.63	518	54.53	200	21.05
Ubangi	240000	248	1.03	19	0.08	1705	7.10	119	0.50	164	0.68	61	0.25
Lower Congo	50000	248	4.96	53	1.06	2233	44.66	264	5.28	366	7.32	131	2.62
Lualaba	323000	247	0.76	18	0.06	4354	13.48	388	1.20	645	2.00	226	0.70
Aruwimi	127500	233	1.83	12	0.09	1455	11.41	150	1.18	213	1.67	69	0.54
Ruki	177000	231	1.31	9	0.05	2211	12.49	81	0.46	328	1.85	103	0.58
Itimbiri	55000	228	4.15	4	0.07	1548	28.15	26	0.47	108	1.96	50	0.91
Upper Lualaba	144000	219	1.52	28	0.19	3449	23.95	371	2.58	644	4.47	160	1.11
Sangha	180000	215	1.19	8	0.04	2012	11.18	181	1.01	195	1.08	72	0.40
Uélé	122000	195	1.60	7	0.06	1104	9.05	85	0.70	184	1.51	83	0.68
Lindi-Tshopo	54000	182	3.37	1	0.02	931	17.24	86	1.59	128	2.37	47	0.87
Lomami	74000	181	2.45	1	0.01	738	9.97	151	2.04	161	2.18	44	0.59
Marine Lower Congo	10000	164	16.40	8	0.80	1421	142.10	104	10.40	192	19.20	123	12.30
Mweru	94000	163	1.73	29	0.31	3376	35.91	327	3.48	569	6.05	155	1.65
Léfini-Likouala	110000	140	1.27	10	0.09	2278	20.71	128	1.16	195	1.77	50	0.45
Sankuru	130000	119	0.92	10	0.08	659	5.07	33	0.25	80	0.62	34	0.26
Tumba	6500	110	16.92	3	0.46	357	54.92	12	1.85	67	10.31	23	3.54
Bangweulu	110000	103	0.94	1	0.01	1325	12.05	172	1.56	190	1.73	70	0.64
Kwilu	85000	86	1.01	5	0.06	130	1.53	19	0.22	34	0.40	26	0.31
Kwango	195000	84	0.43	10	0.05	299	1.53	24	0.12	33	0.17	18	0.09
Mai-Ndombe	40000	72	1.80	8	0.20	89	2.23	27	0.68	16	0.40	25	0.63
Lukenie	76500	51	0.67	2	0.03	275	3.59	18	0.24	32	0.42	21	0.27
Mongala	45000	41	0.91	0	0	93	2.07	9	0.20	17	0.38	14	0.31
Lulonga	67000	20	0.30	0	0	80	1.19	13	0.19	17	0.25	12	0.18
Kotto	71000	19	0.27	1	0.01	126	1.77	15	0.21	12	0.17	16	0.23
Bomu	130000	14	0.11	1	0.01	67	0.52	11	0.08	14	0.11	9	0.07