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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">Doklady Biological Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Biological Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Науки о жизни</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-7389</issn><issn publication-format="electronic">3034-5057</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">684078</article-id><article-id pub-id-type="doi">10.31857/S2686738925020217</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">Mycobiota of acorn worm <italic>Saccoglossus mereschkowskii</italic> (Hemichordata, Enteropneusta) and its habitats</article-title><trans-title-group xml:lang="ru"><trans-title>Микобиота кишечнодышащего <italic>Saccoglossus mereschkowskii</italic> (Hemichordata, Enteropneusta) и его местообитания</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ezhova</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Ежова</surname><given-names>О. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Biological Faculty, Department of Invertebrate Zoology</p></bio><bio xml:lang="ru"><p>биологический факультет, кафедра зоологии беспозвоночных</p></bio><email>olga_ejova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Grum-Grzhimaylo</surname><given-names>O. A.</given-names></name><name xml:lang="ru"><surname>Грум-Гржимайло</surname><given-names>О. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Biological Faculty, N.A. Pertsov White Sea Biological Station</p></bio><bio xml:lang="ru"><p>биологический факультет, Беломорская биологическая станция имени Н.А. Перцова</p></bio><email>olga_ejova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kokurkina</surname><given-names>J. А.</given-names></name><name xml:lang="ru"><surname>Кокуркина</surname><given-names>Ю. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Biological Faculty, Department of Invertebrate Zoology</p></bio><bio xml:lang="ru"><p>биологический факультет, кафедра зоологии беспозвоночных</p></bio><email>olga_ejova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ekimova</surname><given-names>I. А.</given-names></name><name xml:lang="ru"><surname>Екимова</surname><given-names>И. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Biological Faculty, Department of Invertebrate Zoology</p></bio><bio xml:lang="ru"><p>биологический факультет, кафедра зоологии беспозвоночных</p></bio><email>olga_ejova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gantsevich</surname><given-names>М. М.</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><bio xml:lang="en"><p>Biological Faculty, Department of Invertebrate Zoology</p></bio><bio xml:lang="ru"><p>биологический факультет, кафедра зоологии беспозвоночных</p></bio><email>olga_ejova@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><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>Biological Faculty, Department of Invertebrate Zoology, Academician of the RAS</p></bio><bio xml:lang="ru"><p>биологический факультет, кафедра зоологии беспозвоночных, академик РАН</p></bio><email>olga_ejova@mail.ru</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="2025-04-15" publication-format="electronic"><day>15</day><month>04</month><year>2025</year></pub-date><volume>521</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>299</fpage><lpage>304</lpage><history><date date-type="received" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-06-12"><day>12</day><month>06</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</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/2686-7389/article/view/684078">https://journals.eco-vector.com/2686-7389/article/view/684078</self-uri><abstract xml:lang="en"><p>It is known that the tissues and mucous of acorn worms contain phenolic compounds, which inhibit the activity of aerobic bacteria. In this work, the mycobiota of tissues, body surface lavages, and burrows of the acorn worm <italic>Saccoglossus mereschkowskii</italic> (Wagner, 1885) were studied. 3 species of fungi were found in the plating of intestine samples. 7 species were isolated from the body surface lavage of <italic>S. mereschkowskii</italic>. 5 species were found in burrow samples, and 15 species were found in the samples of sediment from the habitat of <italic>S. mereschkowskii</italic>. Plating of intact specimens, gill bars, and axial organ did not reveal the growth of mycelial fungi. This indicates that enteropneust tissues may have a fungistatic effect.</p></abstract><trans-abstract xml:lang="ru"><p>Известно, что ткани и слизь кишечнодышащих содержат фенольные соединения, ингибирующие активность аэробных бактерий. В настоящей работе проведено исследование микобиоты тканей, смывов с поверхности тела и норок кишечнодышащего <italic>Saccoglossus mereschkowskii</italic> (Wagner, 1885). В посевах образцов кишечника обнаружено 3 вида грибов. Из смывов с поверхности тела <italic>S. mereschkowskii</italic> выделено 7 видов, из образцов норок – 5 видов, из образцов осадка в месте обитания <italic>S. mereschkowskii</italic> – 15 видов. Посевы интактных особей, жаберных перегородок и осевого органа не выявили роста мицелиальных грибов; это свидетельствует о том, что ткани кишечнодышащих могут обладать фунгистатическим действием.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Acorn worms</kwd><kwd>sea fungi</kwd><kwd>tissues of acorn worms</kwd><kwd>burrows of acorn worms</kwd><kwd>bottom sediments</kwd><kwd>the White Sea</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>полухордовые</kwd><kwd>морские грибы</kwd><kwd>ткани кишечнодышащих</kwd><kwd>норки кишечнодышащих</kwd><kwd>донные грунты</kwd><kwd>Белое море</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>23–14–00047</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Van der Horst C.J. 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