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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">Paleontological Journal</journal-id><journal-title-group><journal-title xml:lang="en">Paleontological Journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Палеонтологический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0031-031X</issn><issn publication-format="electronic">3034-5871</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">684740</article-id><article-id pub-id-type="doi">10.31857/S0031031X24050119</article-id><article-id pub-id-type="edn">QUOYRY</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">On Taxonomic Affinity of <italic>Davletkulia gigantea</italic> Ivachnenko</article-title><trans-title-group xml:lang="ru"><trans-title>О таксономическом положении Davletkulia gigantea Ivachnenko</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bulanov</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Буланов</surname><given-names>В. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>bulanov@paleo.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Borissiak Paleontological Institute, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Палеонтологический институт им. А.А. Борисяка РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-17" publication-format="electronic"><day>17</day><month>12</month><year>2024</year></pub-date><issue>5</issue><fpage>105</fpage><lpage>113</lpage><history><date date-type="received" iso-8601-date="2025-06-16"><day>16</day><month>06</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://transsyst.ru/0031-031X/article/view/684740">https://transsyst.ru/0031-031X/article/view/684740</self-uri><abstract xml:lang="en"><p>The holotype (an isolated tooth) of the largest-known member of the family Bolosauridae, <italic>Davletkulia gigantea</italic> Ivachnenko, 1990, of middle Permian Yaman-Yushatyr’ locality, Orenburg Region, Russia, is reassigned to the herbivorous dinocephalians of the superfamily Tapinocephaloidea. This attribution is supported by the shape of tooth crown, patterns of wear and resorption, as well as the absence of reparative (tertiary) dentine inside the pulp cavity at the late stage of tooth functioning. The morphology of the holotype reveals the validity of <italic>D. gigantea</italic> which thus is the third representative of the group after <italic>Ulemosaurus svijagensis</italic> and <italic>U. gigas</italic> which was described from Eastern Europe, and, judging by the Otcher age of type locality, the oldest-known tapinocephaloid of the regional tetrapod assemblages.</p></abstract><trans-abstract xml:lang="ru"><p>Подтверждена принадлежность голотипа Davletkulia gigantea Ivachnenko, 1990, исходно описанного по изолированному зубу из среднепермского местонахождения Яман-Юшатырь (Оренбургская обл.) как крупный представитель Bolosauridae (Parareptilia), к растительноядным диноцефалам надсемейства Tapinocephaloidea. На это указывает строение коронки зуба, характер его прижизненного стирания, форма резорбции основания, а также отсутствие репаративных образований пульпы (третичного дентина). Морфология голотипа D. gigantea свидетельствует о валидности этого таксона, который является третьим после Ulemosaurus svijagensis и U. gigas представителем группы, установленным с территории Восточной Европы, а также, исходя из очерского возраста типового местонахождения, наиболее древним тапиноцефалоидом региональных тетраподных ассоциаций.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Bolosauridae</kwd><kwd>Tapinocephaloidea</kwd><kwd>middle Permian</kwd><kwd>Eastern Europe</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Bolosauridae</kwd><kwd>Tapinocephaloidea</kwd><kwd>средняя пермь</kwd><kwd>Восточная Европа</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский фонд фундаментальных исследований</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Foundation for Basic Research</institution></institution-wrap></funding-source><award-id>20-54-12013</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Немецкое научно-исследовательское общество (DFG)</institution></institution-wrap><institution-wrap><institution xml:lang="en">German Research Foundation (DFG)</institution></institution-wrap></funding-source><award-id>20-54-12013</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Голубев В.К. 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