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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Доклады Академии наук</journal-id><journal-title-group><journal-title xml:lang="en">Доклады Академии наук</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-5652</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">14270</article-id><article-id pub-id-type="doi">10.31857/S0869-56524854519-522</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>General biology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Общая биология</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Trophosome in vestimentifera Ridgeia piscesae Jones, 1985 (Annelida, Siboglinidae) develops from cells of the coelomic lining</article-title><trans-title-group xml:lang="ru"><trans-title>Трофосома у вестиментиферы Ridgeia piscesae Jones, 1985 (Annelida, Siboglinidae) развивается из клеток целомической выстилки</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Malakhov</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Малахов</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Corresponding Member of the Russian Academy of Sciences</p></bio><bio xml:lang="ru"><p>Член-корреспондент РАН</p></bio><email>mgantsevich@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gantsevich</surname><given-names>M. M.</given-names></name><name xml:lang="ru"><surname>Ганцевич</surname><given-names>М. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>mgantsevich@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lomonosov Moscow State University</institution></aff><aff><institution xml:lang="ru">"Московский государственный университет имени М.В. Ломоносова"</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-05-22" publication-format="electronic"><day>22</day><month>05</month><year>2019</year></pub-date><volume>485</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>519</fpage><lpage>522</lpage><history><date date-type="received" iso-8601-date="2019-06-20"><day>20</day><month>06</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-06-20"><day>20</day><month>06</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Russian academy of sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Russian academy of sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-5652/article/view/14270">https://journals.eco-vector.com/0869-5652/article/view/14270</self-uri><abstract xml:lang="en"><p>The structure of early juvenile specimens of vestimentifera Ridgeia piscesae (Annelida, Siboglinidae) was studied. As adults, vestimentiphers are deprived of the intestine and have a trophosome, in which cells chemoautotrophic bacteria are living. In early juvenile individuals of 280-300 microns in size, it was found that trophosome develops from cells of the coelomic lining on the surface of the intestine and on the side walls of the body. This structure of the rudiment of the trofosome suggests that the bacteria are first captured by the cell wall of the body and then transferred to the cell on the surface of the intestine.</p></abstract><trans-abstract xml:lang="ru"><p>Исследовали строение ранних ювенильных особей вестиментиферы <italic>Ridgeia piscesae </italic>(Annelida, Siboglinidae). Во взрослом состоянии вестиментиферы лишены кишечника и имеют трофосому, в клетках которой обитают хемоавтотрофные бактерии. У ранних ювенильных особей размером 280-300 мкм обнаружили, что трофосома развивается из клеток целомической выстилки на поверхности кишечника и на боковых стенках тела. Такое строение зачатка трофосомы позволяет предполагать, что бактерии сначала захватываются целомическими клетками стенки тела, а затем передаются целомическим клеткам на поверхности кишечника.</p></trans-abstract><kwd-group xml:lang="en"><kwd>vestimentiferans</kwd><kwd>trophosome</kwd><kwd>development</kwd><kwd>bacteria</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>вестиментиферы</kwd><kwd>трофосома</kwd><kwd>развитие</kwd><kwd>бактерии</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap></funding-source><award-id></award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Hilario A., Capa M., Dahlgren T. G., Halanych K. M., Little C. T.S., Thornhill D. J., Verna C., Glover A. G. 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