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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">677968</article-id><article-id pub-id-type="doi">10.31857/S0031031X24060088</article-id><article-id pub-id-type="edn">QIFDYO</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">Revision of trilobites <italic>Calodiscus</italic> Howell, 1935 (Siberian platform)</article-title><trans-title-group xml:lang="ru"><trans-title>Ревизия трилобитов рода Calodiscus Howell, 1935 (Сибирская платформа)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Korovnikov</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Коровников</surname><given-names>И. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>KorovnikovIV@ipgg.sbras.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bushuev</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Бушуев</surname><given-names>Е. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Novosibirsk branch</p></bio><bio xml:lang="ru"><p>Новосибирский филиал</p></bio><email>KorovnikovIV@ipgg.sbras.ru</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Science</institution></aff><aff><institution xml:lang="ru">Институт нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Novosibirsk State University</institution></aff><aff><institution xml:lang="ru">Новосибирский государственный университет</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">All-Russian Scientific Research Geological Petroleum Institute</institution></aff><aff><institution xml:lang="ru">Всероссийский научно-исследовательский геологический нефтяной институт</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-19" publication-format="electronic"><day>19</day><month>12</month><year>2024</year></pub-date><issue>6</issue><fpage>78</fpage><lpage>91</lpage><history><date date-type="received" iso-8601-date="2025-04-01"><day>01</day><month>04</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/677968">https://transsyst.ru/0031-031X/article/view/677968</self-uri><abstract xml:lang="en"><p>A revision of trilobites of the genus <italic>Calodiscus</italic> Howell, 1935 from the Lower Cambrian of the Siberian platform was carried out. It is shown that of the four representatives of the genus described from the lower Botomian stage of the Lower Cambrian of the General Stratigraphic Scale of Russia, two species <italic>C. helena</italic> (Walcott, 1889) and <italic>C. granulosus</italic> Jegorova et Shabanov, 1972 have significant differences from typical representatives of the genus. The affiliation of these species to the new genus <italic>Paracalodiscus</italic>, belonging to the family Weymouthiidae Kobayashi, 1943, is substantiated. Two other species (<italic>Calodiscus resimus</italic> Repina, 1972, and <italic>C. schucherti</italic> (Matthew, 1896)), although they have some differences from the type representatives, were left in the <italic>Calodiscus</italic> Howell, 1935.</p></abstract><trans-abstract xml:lang="ru"><p>Проведена ревизия трилобитов рода Calodiscus Howell, 1935 из нижнего кембрия Сибирской платформы. Показано, что из четырех представителей рода, описанных из низов ботомского яруса нижнего кембрия, два вида, C. helena (Walcott, 1889) и C. granulosus Egorova et Shabanov, 1972, имеют существенные отличия от типового вида рода. Обоснована принадлежность этих видов новому роду Paracalodiscus, входящему в состав семейства Weymouthiidae Kobayashi, 1943. Два других вида [Calodiscus resimus Repina, 1972 и C. schucherti (Matthew, 1896)] имеют диагностические признаки рода Calodiscus Howell, 1935 и оставлены в нем.</p></trans-abstract><kwd-group xml:lang="en"><kwd>trilobites</kwd><kwd>genus Calodiscus</kwd><kwd>Lower Cambrian</kwd><kwd>Botomian stage</kwd><kwd>Siberian platform</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>трилобиты</kwd><kwd>род Calodiscus</kwd><kwd>нижний кембрий</kwd><kwd>ботомский ярус</kwd><kwd>Сибирская платформа</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Правительство РФ</institution></institution-wrap><institution-wrap><institution xml:lang="en">Government of the Russian Federation</institution></institution-wrap></funding-source></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Бушуев Е.В., Комлев Д.А., Купин А.В. 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