Shrimp species Number of samples Observed species richness Private species Mean + SE number of species per sample Chao2
M. amazonicum 31 26 3 2.8 ± 2.3 42.1
M. brasiliense 16 36 8 4.5 ± 6.0 49.5
M. carcinus 10 10 1 1.9 ± 1.4 28.9
M. olfersii 36 51 8 6.4 ± 6.0 59.8
Eurhyrinchus sp. 8 9 1 2.4 ± 2.4 14.5
Total 101 68 21 4.6 ± 4.8 99.68