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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">Stratigraphy and Geological Correlation</journal-id><journal-title-group><journal-title xml:lang="en">Stratigraphy and Geological Correlation</journal-title><trans-title-group xml:lang="ru"><trans-title>Стратиграфия. Геологическая корреляция</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-592X</issn><issn publication-format="electronic">3034-6037</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">658039</article-id><article-id pub-id-type="doi">10.31857/S0869592X24060031</article-id><article-id pub-id-type="edn">VZBBQN</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">Taxonomic composition of the Hauterivian bryozoan assemblage in the environs of Gunib village (Dagestan)</article-title><trans-title-group xml:lang="ru"><trans-title>Таксономический состав комплекса готеривских мшанок района села Гуниб, Дагестан</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Koromyslova</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Коромыслова</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>koromyslova.anna@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gavrilov</surname><given-names>Yu. O.</given-names></name><name xml:lang="ru"><surname>Гаврилов</surname><given-names>Ю. О.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>yugavrilov@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Borisyak Paleontological Institute, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Палеонтологический институт им. А.А. Борисяка РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Geological Institute, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Геологический институт РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>32</volume><issue>6</issue><fpage>74</fpage><lpage>100</lpage><history><date date-type="received" iso-8601-date="2025-02-20"><day>20</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</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/0869-592X/article/view/658039">https://journals.eco-vector.com/0869-592X/article/view/658039</self-uri><abstract xml:lang="en"><p>The Lower Cretaceous bryozoan assemblage in the environs of Gunib village in Dagestan is for the first time described. The studied section is located in the zone of development of the Gapshima Formation (Hauterivian) deposits. The bryozoan assemblage is characterized by high taxonomic diversity and includes 32 taxa from four suborders of order Cyclostomata: Tubuliporina (24 taxa), Cancellata (1 taxon), Articulina (1 taxon) и Cerioporina (6 taxa). Due to the poor preservation of the colonies, most taxa are defined in open nomenclature; therefore, the true diversity of cyclostomes in the study area is not fully reflected. The assemblage includes the taxa that have the similarities to bryozoans previously described from different levels from Valanginian to Barremian of Switzerland and France and, partly, from the lower Hauterivian of Germany (<italic>Mecynoecia icaunensis</italic> (d’Orbigny), <italic>Mesenteripora marginata</italic> (d’Orbigny), <italic>M. reticulata</italic> (d’Orbigny), <italic>Poriceata ardescensis</italic> Walter, <italic>Apsendesia neocomiensis</italic> d’Orbigny, <italic>Diplocava biformis</italic> (Roemer), “<italic>Heteropora</italic>” <italic>arborea</italic> Koch et Dunker, and <italic>Elea periallos</italic> Taylor). The main difference of the Gunib assemblage from the Valanginian–Hauterivian assemblage of Switzerland and France and the lower Hauterivian assemblage of Germany is in having bryozoans from the family of Eleidae, but it differs from the Barremian assemblage of France in lacking of representatives of Cheilostomata. Among the studied cyclostomes, bryozoans with erect colonies predominate, some of which were bilateral leaf-shaped, while others had thin cylindrical branches. Reticulate and massive colonies are rare, while encrusting bryozoans, which grow over erect colonies, are quite numerous.</p></abstract><trans-abstract xml:lang="ru"><p>Впервые описан комплекс мшанок из отложений нижнего мела близ села Гуниб в Дагестане. Изученный разрез находится в зоне развития отложений гапшиминской свиты (готерив). Комплекс мшанок отличается высоким таксономическим разнообразием и включает 32 таксона из четырех подотрядов отряда Cyclostomata: Tubuliporina (24 таксонов), Cancellata (1 таксон), Articulina (1 таксон) и Cerioporina (6 таксонов). Из-за плохой сохранности колоний большинство таксонов определены в открытой номенклатуре, в результате чего истинное разнообразие циклостомат в районе исследования отражено не полностью. Комплекс включает таксоны, которые имеют сходство с мшанками, ранее описанными из разных уровней от валанжина до баррема Швейцарии и Франции и, частично, из нижнего готерива Германии (Mecynoecia icaunensis (d’Orbigny), Mesenteripora marginata (d’Orbigny), M. reticulata (d’Orbigny), Poriceata ardescensis Walter, Apsendesia neocomiensis d’Orbigny, Diplocava biformis (Roemer), “Heteropora” arborea Koch et Dunker и Elea periallos Taylor). Главное отличие гунибского комплекса от валанжин-готеривского комплекса Швейцарии и Франции и нижнеготеривского Германии – наличие мшанок из семейства Eleidae, а от барремского комплекса Франции – отсутствие представителей Cheilostomata. Среди изученных циклостомат преобладают мшанки с вертикально растущими колониями, одни из которых были билатеральные листовидные, а другие имели тонкие цилиндрические ветви. Сетчатые и массивные колонии редки, тогда как инкрустирующие мшанки, обраставшие вертикальные колонии, достаточно многочисленны.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Bryozoans</kwd><kwd>Cyclostomata</kwd><kwd>Lower Cretaceous</kwd><kwd>Dagestan</kwd><kwd>taxonomy</kwd><kwd>µCT</kwd><kwd>stratigraphy</kwd><kwd>palaeogeography</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Bryozoa</kwd><kwd>Cyclostomata</kwd><kwd>нижний мел</kwd><kwd>Дагестан</kwd><kwd>таксономия</kwd><kwd>рентгеновская компьютерная микротомография</kwd><kwd>стратиграфия</kwd><kwd>палеогеография</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Вискова Л.А. Морские постпалеозойские мшанки. М.: Наука, 1992. 187 с. (Тр. Палеонтол. ин-та АН СССР. Т. 250).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Вискова Л.А. 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