Show simple item record Halajian, Ali Jaglarz, Mariusz K. Bilinski, Szczepan M. 2020-06-20T13:44:32Z 2020-06-20T13:44:32Z 2018
dc.identifier.issn 19326203
dc.identifier.issn 0195647
dc.description Article published in the PLoS ONE 13 (4): en_US
dc.description.abstract Matrotrophic viviparity is a reproductive pattern in which offspring develop inside a female's body which provides gas exchange and nutrients necessary for development. Besides placental mammals, structural and physiological aspects of matrotrophic viviparity are poorly characterized. In insects, the majority of species is oviparous, i.e. lay eggs, and viviparous reproduction has been reported only in 11 out of 44 orders, including earwigs (Dermaptera). Among dermapterans, matrotrophic viviparity has been reported in two epizoic subgroups: Arixeniidae and Hemimeridae. Here, we provide morphological evidence for distinct adaptations for this mode of viviparity in embryonic and maternal tissues in a representative of the latter subgroup, Hemimerus talpoides. Our study reveals a novel mechanism of maternal contribution to embryonic development which operates during oogenesis and involves characteristic modification of endoplasmic reticulum cisternae. Conspicuous and apparently inactive para-crystalline stacks of the endoplasmic reticulum are deposited in the oocyte cytoplasm and become activated during early embryonic development. Our analyses indicate additionally that in Hemimerus, transformed follicular/ovarian cells (on the mother's side) and an evagination of the dorsal vessel (on the embryo's side) converge to form a cephalic vesicle, structure analogous to a placenta. The cellular architecture of this unusual ªcephalic placentaº points to its participation in an exchange of low molecular weight substances between a mother and developing embryo. en_US
dc.format.extent 10 pages en_US
dc.language.iso en en_US
dc.publisher PLoS ONE en_US
dc.relation.requires pdf en_US
dc.subject Unusual morphological adaptations en_US
dc.subject Processes en_US
dc.subject Viviparity en_US
dc.subject Epizoic dermapteran en_US
dc.subject.lcsh Insects-Embryology en_US
dc.subject.lcsh Insects-Reproduction en_US
dc.title Unusual morphological adaptations and processes associated with viviparity in an epizoic dermapteran en_US
dc.type Article en_US

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