On a Freshwater Gymnodinium sp. with Unusual Nuclear Organization

Abstract

The present study deals with an interesting nucleus of a freshwater Indian dinoflagellate which is designated here as Gymnodinium sp. NBG 76. Chromosomes appear as small dots or short rods and are too many to be counted for their exact numbers. However, an estimate of 514±10 chromosomes was made from suitable preparations. The presence of rod-shaped chromosomes and uniform condensation of the latter even at interphase reflect on its dinocaryotic nature. The unusual nuclear structure of this taxon has been discussed in relation to the dinokaryotic nuclei met with in other taxa.