Osservazioni cariologiche sui Proturi (Insecta, Protura)
The karyotypes of four species of Prot ra (Insecta, Apterigota) were determined. The diploid chromosome numbers range from eight to twenty. No sex chromosome could be morphologically detected. The chromosome centromeres are localized. The absence of males and the uncoupling of the oocyte chromosomes in Proturentomon minimum indicate a parthenogenetic way.