Ovaries and germline cysts and their evolution in Dermaptera (Insecta)

Abstract:

We studied the ovary structure and initial stages of oogenesis in 15 representatives of several dermapteran taxa, including the epizoic Arixeniina. In all examined species, the ovaries are meroisticepolytrophic.The ovaries of the basal taxa (‘Pygidicranidae’, ‘Diplatyidae’, and Labiduridae) are composed of elongated ovarioles, attached to short lateral oviducts. In these groups, ovarioles contain several (more than 30) ovarian follicles in a linear arrangement. In the Eudermaptera, the ovaries are composed of 1e6 (Spongiphoridae) or 20e40 (Forficulidae, Chelisochidae) short ovarioles (containing 2 ovarian follicles only) that open to strongly elongated lateral oviducts. In all investigated dermapterans, the ovarian follicles are composed of two germline cells only: an oocyte and a polyploid nurse cell that are covered by a simple follicular epithelium. Our studies indicate that despite a rather unique morphology of the ovarian follicles in the examined species, the processes leading to the formation of the oocyte and nurse cell units are significantly different in basal versus derived taxa. The ovaries of Arixenia esau are composed of 3 short ovarioles attached to a strongly dilated lateral oviduct, ‘the uterus’, containing developing embryos. Histological analysis suggests that the origin of the oocyte and nurse cell units in this species follows the pattern described in eudermapterans.The interpretation of our results in an evolutionary context supports the monophyly of the Dermaptera and Eudermaptera, and the inclusion of the Arixeniina and Hemimerina in the latter taxon
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APA

Waclaw, T & Waclaw, T (2024). Ovaries and germline cysts and their evolution in Dermaptera (Insecta). Afribary. Retrieved from https://afribary.com/works/ovaries-and-germline-cysts-and-their-evolution-in-dermaptera-insecta

MLA 8th

Waclaw, Tworzydio and Tworzydio Waclaw "Ovaries and germline cysts and their evolution in Dermaptera (Insecta)" Afribary. Afribary, 10 Mar. 2024, https://afribary.com/works/ovaries-and-germline-cysts-and-their-evolution-in-dermaptera-insecta. Accessed 26 May. 2024.

MLA7

Waclaw, Tworzydio, Tworzydio Waclaw . "Ovaries and germline cysts and their evolution in Dermaptera (Insecta)". Afribary, Afribary, 10 Mar. 2024. Web. 26 May. 2024. < https://afribary.com/works/ovaries-and-germline-cysts-and-their-evolution-in-dermaptera-insecta >.

Chicago

Waclaw, Tworzydio and Waclaw, Tworzydio . "Ovaries and germline cysts and their evolution in Dermaptera (Insecta)" Afribary (2024). Accessed May 26, 2024. https://afribary.com/works/ovaries-and-germline-cysts-and-their-evolution-in-dermaptera-insecta