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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">litosphere</journal-id><journal-title-group><journal-title xml:lang="ru">Литосфера</journal-title><trans-title-group xml:lang="en"><trans-title>LITHOSPHERE (Russia)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1681-9004</issn><issn pub-type="epub">2500-302X</issn><publisher><publisher-name>A.N. Zavaritsky Institute of Geology and Geochemistry</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.24930/1681-9004-2022-22-3-347-360</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-1657</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Особенности морфологии, изменений в онтогенезе и стратиграфического распространения конодонтов Siphonodella belkai Dzik (турнейский ярус, нижний карбон)</article-title><trans-title-group xml:lang="en"><trans-title>Morphological features, ontogenetic changes and stratigraphic range of conodonts Siphonodella belkai Dzik (Tournaisian, Mississippian)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Журавлев</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhuravlev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>167000, Сыктывкар, Первомайская 54.</p></bio><bio xml:lang="en"><p>Andrey V. Zhuravlev.</p><p>54 Pervomayskaya st., 54167000 Syktyvkar.</p></bio><email xlink:type="simple">micropalaeontology@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геологии ФИЦ Коми НЦ УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geology FIC Komi SC UrB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>02</day><month>07</month><year>2022</year></pub-date><volume>22</volume><issue>3</issue><fpage>347</fpage><lpage>360</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Журавлев А.В., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Журавлев А.В.</copyright-holder><copyright-holder xml:lang="en">Zhuravlev A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.lithosphere.ru/jour/article/view/1657">https://www.lithosphere.ru/jour/article/view/1657</self-uri><abstract><p>Объект исследования. В статье рассматривается комплексная характеристика вида конодонтов Siphonodella belkai Dzik, являющегося видом-индексом в зональной последовательности турнейского яруса нижнего карбона. Материал и методы. Фактическим материалом послужили результаты изучения коллекций конодонтов из разрезов северного Приуралья и западного склона Приполярного Урала. Представители Siphonodella belkai (89 экземпляров) обнаружены в разрезах бассейна р. Кожим (Приполярный Урал) и на р. Вангыр (поднятие Чернышева). Проведено исследование гистологического строения, морфологии и онтогенетических изменений платформенных элементов данного вида с помощью электронного и светового микроскопа, а также рентгеновского микротомографа. Биометрический анализ осуществлен на 45 полных экземплярах. Результаты. Siphonodella belkai уверенно диагностируются по гладкой платформе линзовидной формы, несущей развитые ростральные гребни. В платформе и ростральных гребнях присутствуют массивы параламеллярной ткани; распространение альбидной ткани ограничено соседними с главным зубцом зубцами осевого гребня. Правые и левые P1 элементы данного таксона образуют асимметричные пары и отличаются расположением и количеством ростральных гребней (III класс симметрии). Пропорции элементов остаются постоянными в онтогенезе. Формирование ростральных гребней начинается на ранних стадиях онтогенеза, при длине элемента около 0.4-0.5 мм, что обеспечивает надежную таксономическую диагностику. Выводы. Вид Siphonodella belkai известен из разрезов умеренно глубоководных отложений Центральной и Восточной Европы и Южного Китая. Подошва зоны S. belkai при определении по первому появлению вида-индекса совпадает с подошвой зоны Upper duplicata. Выделение зоны S. belkai в качестве стандартной нецелесообразно из-за редкой встречаемости, ограниченного ареала и узкого фациального диапазона вида-индекса. Эта зона имеет крайне низкий корреляционный потенциал.</p></abstract><trans-abstract xml:lang="en"><p>Research subject. Multidisciplinary characteristics of the Siphonodella belkai Dzik conodonts, which an index species in the Tournaisian (Mississippian) conodont zonation. Materials and methods. Data on conodonts collected from the North Cis-Urals and Subpolar Urals sections was used. In total, 89 specimens of Siphonodella belkai were found in the Kozhim Eiver basin sections (Subpolar Urals) and the Vangyr River section (Tchernyshev Uplift). The histology, morphology and ontogeny of platform elements of this species were studied using SEM, optic microscope and X-ray micro-CT. In total, 45 complete specimens were biometrically studied. Results. Siphonodella belkai can be reliably distinguished by having a smooth lens-like platform and bearing developed rostral ridges. The paralamellar tissue occurs in the platform and rostral ridges; distribution of the albid tissue is restricted by carina denticles in the cusp neighborhood. Sinistral and dextral P1 elements of the species compose asymmetric pairs and differ by the position and number of rostral ridges (Class III of symmetry). The element outline remains constant in ontogeny. Rostral ridges appear at early ontogeny stages, when an element is of 0.4-0.5 mm in length, thus allowing reliable taxonomic diagnostics. Conclusions. Siphonodella belkai is known from the moderately deep-water deposits of the Central and Eastern Europe and South China. The base of the S. belkai zone, marked by the first appearance of the eponimic taxon, coincides with the base of the Upper duplicata zone. Distinguishing the S. belkai zone as a standard zone seems unreasonable due to the rarity, restricted area and specific ecology of S. belkai. This zone is of low correlation potential.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>конодонты</kwd><kwd>морфология</kwd><kwd>онтогенез</kwd><kwd>нижний карбон</kwd><kwd>биостратиграфия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>conodonts</kwd><kwd>morphology</kwd><kwd>ontogeny</kwd><kwd>Mississippian</kwd><kwd>biostratigraphy</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Журавлев А.В. (2003) Конодонты верхнего девона-нижнего карбона Северо-Востока Европейской России. СПб.: ВСЕГЕИ, 85 с.</mixed-citation><mixed-citation xml:lang="en">Bardasheva N.P., Bardashev I.A., Weddige K., Ziegler W. (2004) Stratigraphy and conodonts of the Lower Carboniferous of the Shishkat section (southern Tien Shan, Tajikistan). 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