In four species, M. extradentata, S. inexpectata, S. sipylus, and P. khaoyaiensis chromosome analyses were performed only on embryos obtained from parthenogenetic females. Chromosome numbers were determined, patterns of C-banding described, and FISH with a labeled fragment of 18S rDNA and telomeric repeats was carried out. In P. schultei, additionally to chromosomes from embryos, meiotic chromosomes of two males were analyzed.