Dermaptera; phylogeny; oogenesis; ovariols

Some research has been conducted on phylogenic relationship within Dermaptera. However, those studies still do not answer all the question about their relationships. It has been previously shown that representatives of various subgroups of earwigs may significantly differ in structure of ovaries and a course of oogenesis. Therefore we consider ovaries and oogenesis to be useful characters for phylogenic studies. In all studied species, ovarian follicles are composed of two cells only: an oocyte and a polyploid nurse cell that are connected by a simple intercellular bridge. Although, the final number of cells constituting the ovarian follicle is constant in Dermaptera, the processes that lead to their formation in various earwig subgroups are apparently different.