Karyology of five species of Turbellaria from the Øresund, Denmark

Abstract
The karyotypes of five species of Turbellaria from the Øresund, Denmark, were determined. The chromosome numbers were found to be 2n = 6, n = 3 in the germinal line of Monocelis lineata (Proseriata), and 2n = 14 from metaphase plates from regenerative blastema of Procerodes littoralis (Tricladida). In Discocelides langi and Cryptocelides loveni (both Polycladida) the diploid number was found to be 2n = 20, and in C. loveni an analysis of male and female meiosis was also carried out. In Notoplana atomata (Polycladida) the chromosome numbers were ascertained to be 2n = 18, n = 9, and this finding is discussed with reference to the chromosome sets previously described within the same genus.