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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">684381</article-id><article-id pub-id-type="doi">10.31857/S0031031X25020102</article-id><article-id pub-id-type="edn">DCLOJB</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">Discovery of discosauriscid seymouriamorhs (Tetrapoda) in the middle Permian of European Russia</article-title><trans-title-group xml:lang="ru"><trans-title>Находка дискозаврисцидных сеймуриаморф (Tetrapoda) в средней перми Восточной Европы</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="2025-06-04" publication-format="electronic"><day>04</day><month>06</month><year>2025</year></pub-date><issue>2</issue><fpage>101</fpage><lpage>115</lpage><history><date date-type="received" iso-8601-date="2025-06-14"><day>14</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://transsyst.ru/0031-031X/article/view/684381">https://transsyst.ru/0031-031X/article/view/684381</self-uri><abstract xml:lang="en"><p>A new species of discosauriscid seymouriamorphs, <italic>Ariekanerpeton kuedensis</italic> sp. nov., is described based on the skull of a larval individual from the Klyuchiki locality, Perm Region, Russia. The new form differs from the type species of <italic>Ariekanerpeton</italic>,<italic> A. sigalovi</italic> (Tatarinov, 1968), in the structure of the occipital and suborbital regions the skull roof, as well as in the mandible. The specimen from Klyuchiki extends the stratigraphic distribution of the family Discosauriscidae up to the Upper Ufimian–Kazanian of the middle Permian (Kungurian–Roadian interval), provides the first valid evidence of this group in the East European tetrapod associations, and records the existence of the genus <italic>Ariekanerpeton</italic> outside the Asian region of Laurasia for the first time.</p></abstract><trans-abstract xml:lang="ru"><p>Из местонахождения Ключики (Россия, Пермский край) по черепу ларвального экземпляра описан новый представитель дискозаврисцидных сеймуриаморф – Ariekanerpeton kuedensis sp. nov. Отличия новой формы от типового вида Ariekanerpeton – A. sigalovi (Tatarinov, 1968) – выявлены в строении затылочного и подглазничного отделов крыши черепа, а также нижней челюсти. Находка из Ключиков пролонгирует диапазон стратиграфического распространения семейства Discosauriscidae до верхнеуфимско-казанских отложений средней перми (кунгур-роудский интервал), является первым достоверным свидетельством его присутствия в составе восточноевропейских тетраподных ассоциаций, а также впервые фиксирует существование рода Ariekanerpeton за пределами азиатского сегмента Лавразии.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Discosauriscidae</kwd><kwd>Ariekanerpeton kuedensis</kwd><kwd>middle Permian</kwd><kwd>Eastern Europe</kwd><kwd>cranial morphology</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Discosauriscidae</kwd><kwd>Ariekanerpeton kuedensis sp. nov.</kwd><kwd>средняя пермь</kwd><kwd>Восточная Европа</kwd><kwd>краниальная морфология</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>23-24-0007</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Бакаев А.С., Буланов В.В., Илалтдинов И.Я. и др. 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