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Spermatogenesis and organization of spermatozoon in deep sea water brachiopod pelagodiscus spтезисы доклада
- Авторы: Temereva E.N., Kuzmina T.V.
- Сборник: Fourteenth International Congress on Invertebrate Reproduction and Development
- Тезисы
- Год издания: 2017
- Место издания: Napoli, Italy
- Первая страница: 41
- Аннотация: Peculiarities of spermatogenesis and organization of sperm are usually useful for reconstruction of phylogeny in close related groups of invertebrates. It is especially important for reconstruction of phylogeny of such an enigmatic group as brachiopods. In addition, deep sea water invertebrates usually have specific development and specific gametogenesis. The spermatogenesis and ultrastructure of sperm are studied in deep sea water discinid brachiopod <Pelagodiscus> sp. During spermatogenesis, several proacrosomal vesicles appear near the basal body at the posterior pole of cell; these vesicles then fuse each other and migrate to anterior pole. In spermatid, the anterior acrosome is bowler-shaped with electron dense proximal edge and lighter central area. In spermatozoon, the acrosome becomes more flattened, but lateral electron dense portions are retained. The nucleus has posterior deep invagination, which occupies the central area of the nucleus. The presence of this invagination makes the nucleus similar to hula-hoop. The mid-piece is composed of a ring of four mitochondria which surround the proximal and distal centrioles which are arranged orthogonally. The distal centriole bears the nine main branches of the anchoring apparatus. Each branch has two branches which join and form a star-like structure. Presence of deep invaginations in nucleus makes spermatozoon of <Pelagodiscus> sp. similar to that of craniid <Novocrania anomala>. The ultrastructure of acrosome has a lot in common in <Pelagodiscus> sp. and lingulid <Lingula anatina>, whereas the centriole is organized similar in <Pelagodiscus> sp. and in articulate brachiopods. Organization of spermatozoon supports an opinion on separation of Discinoidea from Linguloidea. Study is supported by RFBR (17-04-00586).
- Добавил в систему: Темерева Елена Николаевна