The diploid number of chromosomes of Macrobrachium siwalikensis, Paratelphusa (Barytelphusa) masoniana, and Potamon (Potamon) koolooense is 100, 134, and 80, respectively. All the chromosomes in M. siwalikensis are metacentric, but in the remaining two species the centromere location could not be determined due to their small size.
No morphologically distinguishable sex-chromosomes have been observed in any of the species studied.