Abstract
Nine species of the genus Neodendrocoelum from Lake Ohrid, five from sublittoral and four from littoral regions, have a diploid chromosome complement 2n=32 and show a marked resemblance in their karyotypes, comprising four large pairs (group L), seven medium pairs (group M) and five small pairs (group S). Polymorphism has only been found in groups S. Variations in chiasma frequency in the species of this genus indicate that their meiotic systems are different. In these species the number of quadrivalent were found to be different in metaphase I. The process of speciation of this genus was manifested in the diploidization of autotetraploid species.
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Paunović, D. A cytogenetic analysis of the genus Neodendrocoelum (Triclada, paludicola) from Lake Ohrid. Chromosoma 63, 161–180 (1977). https://doi.org/10.1007/BF00292728
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DOI: https://doi.org/10.1007/BF00292728