Abstract
Chromosome numbers of six species of the Palaemonidae were determinated using mocified air-dry methods applied to the tesis, the regenerating biastema of the 2nd pereopod, and the ovary after the eyestalk ablation. As shown in Table 2 of the results, chromosome numbers of four species of Macrobrachium range 2n=102 and 118, and that of two species of Palaemon 2n=108 and 136. Most of the chromosomes in the examined species were metacentric and submetacentric types. And the fundamental numbers of chromosomes had wide range between these species. Considering from these results, the specific differentiation of Palaemonidae would be characterized by some possible consequence of both Robertsonian fragmentation-fusion and chromosomal rearrangements.
