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Spermatogenesis in the deep-sea brachiopod Pelagodiscus atlanticus and the phylogenetic significance of spermatozoon structureстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 сентября 2019 г.
- Авторы: Temereva E.N., Kuzmina T.V.
- Журнал: Journal of Morphology
- Том: 279
- Номер: 11
- Год издания: 2018
- Издательство: John Wiley & Sons Inc.
- Местоположение издательства: United States
- Первая страница: 1579
- Последняя страница: 1589
- DOI: 10.1002/jmor.20887
- Аннотация: Details of spermatogenesis and sperm organization are often useful for reconstructing the phylogeny of closely related groups of invertebrates. Development in general and gametogenesis in particular usually differ in shallow water and deep-sea invertebrates. Here, the spermatogenesis and ultrastructure of sperm were studied in the deep-sea brachiopod Pelagodiscus atlanticus. The testes of P. atlanticus are voluminous sacs located along the lateral sides of the body. Germ cells develop around the blood capillaries, contact the basal lamina, and contain germ plasm, numerous mitochondria, Golgi apparatus, lipid droplets, and centrioles of the rudimentary cilium. During spermatogenesis, several proacrosomal vesicles appear at the posterior pole of the cell; these vesicles then fuse and migrate to the anterior pole. The spermatozoon has a head with an acrosome, nucleus, eight mitochondria, proximal and distal centrioles orthogonally arranged, and a long tail. Comparative analysis revealed that the spermatozoon of P. atlanticus must be regarded as the most primitive among all brachiopods. Such an organization indicates that fertilization is external in this deep-sea species. Spermatozoa of other brachiopods should be regarded as derived from this primitive type. The transformation of brachiopod spermatozoa might have occurred in three different ways that correspond to the three main clades of recent brachiopods: Linguliformea, Craniiformea, and Rhynchonelliformea.
- Добавил в систему: Темерева Елена Николаевна