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Unusual morphological adaptations and processes associated with viviparity in an epizoic dermapteran.
Bilinski, Szczepan M; Jaglarz, Mariusz K; Halajian, Ali; Tworzydlo, Waclaw.
Afiliação
  • Bilinski SM; Department of Developmental Biology and Invertebrate Morphology, Institute of Zoology and Biomedical Research, Jagiellonian University, Gronostajowa 9, Krakow, Poland.
  • Jaglarz MK; Department of Developmental Biology and Invertebrate Morphology, Institute of Zoology and Biomedical Research, Jagiellonian University, Gronostajowa 9, Krakow, Poland.
  • Halajian A; Department of Biodiversity, University of Limpopo, Sovenga, South Africa.
  • Tworzydlo W; Department of Developmental Biology and Invertebrate Morphology, Institute of Zoology and Biomedical Research, Jagiellonian University, Gronostajowa 9, Krakow, Poland.
PLoS One ; 13(4): e0195647, 2018.
Article em En | MEDLINE | ID: mdl-29694411
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 "cephalic placenta" points to its participation in an exchange of low molecular weight substances between a mother and developing embryo.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Oócitos / Viviparidade não Mamífera / Insetos Tipo de estudo: Risk_factors_studies Limite: Animals Idioma: En Revista: PLoS One Assunto da revista: CIENCIA / MEDICINA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Polônia

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Oócitos / Viviparidade não Mamífera / Insetos Tipo de estudo: Risk_factors_studies Limite: Animals Idioma: En Revista: PLoS One Assunto da revista: CIENCIA / MEDICINA Ano de publicação: 2018 Tipo de documento: Article País de afiliação: Polônia