Venn diagram at distance 0.03. The total richness of all groups is 9871. The number of species in group C1 is 3851, group C2 is 4553, and group C3 is 3807. The number of common species between groups C1 and C2 is 991, between groups C1 and C3 is 1041, and between groups C2 and C3 is 1062. The total shared richness is 754.