Very few studies have been involved with karyology in Planarian living in total darkness. The first results indicate however, that most of the hypogeous Paludicoles have a diploid chromosome number notably superior to the similar surface forms. In another connection a relative uniformity of the morphology of the chromosome is observed in the same group, so that the studied karyotypes show a similar general aspect.
Recent karyological research on cave planarians from Europe.
International Journal of Speleology,
Available at: https://scholarcommons.usf.edu/ijs/vol8/iss1/5