Karyology of the Genus Cyclotella Kuetz.(Bacillariophyta).

Four freshwater centric diatom taxa, Cyclotella glomerata, C. striata, C. meneghiniana f. unipunctata and C. catenata were investigated karyologically and their important karyological features have been described and discussed. First two taxa contained same chromosome number 2n=12 while C. meneghiniana f. unipunctata and C. catenata revealed 2n=18 and 24 chromosomes, respectively. Chromosomes did not show structural organization and appear like either small or large dots ranging from 0.25 to 1.8μm in size. Chromosomes organize into either a ring or plate at metaphase in the equatorial region.