Oogenesis in the viviparous phoronid, Phoronis embryolabi

Temereva, E.N.

Автор: Temereva E.N.
Журнал: Journal of Morphology
Том: 279
Номер: 2
Год издания: 2018
Издательство: John Wiley & Sons Inc.
Местоположение издательства: United States
Первая страница: 199
Последняя страница: 215
DOI: 10.1002/jmor.20765
Аннотация: The study of gametogenesis is useful for phylogenetic analysis and can also provide insight into the physiology and biology of species. This report describes oogenesis in the Phoronis embryolabi, a newly described species, which has unusual for phoronids type of development – a viviparity of larvae. Phoronid oogonia are described here for the first time. Yolk formation is autoheterosynthetic. Heterosynthesis occurs in the peripheral cytoplasm via fusion of endocytosic vesicles. Simultaneously, the yolk is formed autosynthetically by rough endoplasmic reticulum in the central cytoplasm. Each developing oocyte is surrounded by the follicle of vasoperitoneal cells, whose cytoplasm is filled with glycogen particles and various inclusions. Cytoplasmic bridges connect developing oocytes and vasoperitoneal cells. These bridges and presence of the numerous glycogen particles in vasoperitoneal cells suggest that nutrients are transported from the follicle to oocytes. Phoronis embryolabi is just the second phoronid species in which the ultrastructure of oogenesis has been studied, and I discussed the data obtained comparing them with those in Phoronopsis harmeri. Finally, I discussed the distribution of reproductive patterns across both, molecular and morphological phylogenetic trees in Phoronida proving that parental care has evolved independently several times in this phylum.
Добавил в систему: Темерева Елена Николаевна

	ИСТИНА	Войти в систему Регистрация
	ИСТИНА ЦЭМИ РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИСТИНА ЦЭМИ РАН

Oogenesis in the viviparous phoronid, Phoronis embryolabiстатья

Прикрепленные файлы