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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">684731</article-id><article-id pub-id-type="doi">10.31857/S0031031X24050024</article-id><article-id pub-id-type="edn">QUYUND</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">New Species of the <italic>Acanthonautilus</italic> (Solenochilidae, Nautilida) from the Early Permian Shakhtau Reef (Cisurals)</article-title><trans-title-group xml:lang="ru"><trans-title>Новые виды Acanthonautilus из раннепермского рифа Шахтау (Предуралье)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shchedukhin</surname><given-names>A. Yu.</given-names></name><name xml:lang="ru"><surname>Щедухин</surname><given-names>А. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>d_alsch2017@mail.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>15</fpage><lpage>25</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://journals.eco-vector.com/0031-031X/article/view/684731">https://journals.eco-vector.com/0031-031X/article/view/684731</self-uri><abstract xml:lang="en"><p>Two new species of <italic>Acanthonautilus</italic> Foord, 1896 (family Solenochilidae Hyatt, 1893) from Asselian-Sakmarian reef deposits of the Shakhtau quarry are described. The history of the study of Solenochilidae is briefly discussed. Comparison with other Paleozoic cephalopods with similar morphology is presented. Morphometric parameters proposed by D. Raup were used for more precise characterization of the new species.</p></abstract><trans-abstract xml:lang="ru"><p>Описано два новых вида Acanthonautilus Foord, 1896 (семейство Solenochilidae Hyatt, 1893) из ассельско–сакмарских рифовых отложений карьера Шахтау. Кратко рассмотрена история изучения Solenochilidae. Проведено сравнение с другими палеозойскими цефалоподами со сходной морфологией. Для более точной характеристики новых видов использованы морфометрические параметры, предложенные Д. Раупом.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Nautilida</kwd><kwd>Solenochilidae</kwd><kwd>Lower Permian</kwd><kwd>Asselian</kwd><kwd>Sakmarian</kwd><kwd>Cisurals</kwd><kwd>Shikhans</kwd><kwd>Shakhtau</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Nautilida</kwd><kwd>Solenochilidae</kwd><kwd>нижняя пермь</kwd><kwd>ассельский ярус</kwd><kwd>сакмарский ярус</kwd><kwd>Предуралье</kwd><kwd>шиханы</kwd><kwd>Шахтау</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Круглов М.В. Верхнекаменноугольные и артинские наутилиды Урала // Тр. Геол. музея АН СССР. 1928. Т. 3. С. 63–206.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Круглов М.В. Верхнепермские наутилиды бассейна рек Пинеги и Кулоя // Тр. Геол. ин-та АН СССР. 1933. Т. 3. С. 185–208.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Руженцев В.Е., Богословская М.Ф. Намюрский этап в эволюции аммоноидей. 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