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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="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Genetics</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Genetics</journal-title><trans-title-group xml:lang="ru"><trans-title>Генетика</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0016-6758</issn><issn publication-format="electronic">3034-5103</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">666887</article-id><article-id pub-id-type="doi">10.31857/S0016675823020066</article-id><article-id pub-id-type="edn">KXUTDG</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>ГЕНЕТИКА ЖИВОТНЫХ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Genetic Differentiation of the Fourhorn Sculpin <italic>Myoxocephalus quadricornis</italic> (Linnaeus, 1758) and Its Position in the Tribe Myoxocephalini Taranetz (Cottidae: Myoxocephalinae)</article-title><trans-title-group xml:lang="ru"><trans-title>Генетическая дифференциация четырехрогого керчака <italic>Myoxocephalus quadricornis</italic> (Linnaeus, 1758) и его положение в трибе Myoxocephalini Taranetz (Cottidae: Myoxocephalinae)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Moreva</surname><given-names>I. N.</given-names></name><name xml:lang="ru"><surname>Морева</surname><given-names>И. Н.</given-names></name></name-alternatives><email>irruz@yandex.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>Radchenko</surname><given-names>O. A.</given-names></name><name xml:lang="ru"><surname>Радченко</surname><given-names>О. А.</given-names></name></name-alternatives><email>irruz@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Petrovskaya</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Петровская</surname><given-names>А. В.</given-names></name></name-alternatives><email>irruz@yandex.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Zhirmunsky National Scientific Center of Marine Biology, Far East Branch, 
Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Национальный научный центр морской биологии им. А.В. Жирмунского 
Дальневосточного отделения Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Biological Problems of the North, Far East Branch, 
Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологических проблем Севера Дальневосточного отделения 
Российской академии наук</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-02-01" publication-format="electronic"><day>01</day><month>02</month><year>2023</year></pub-date><volume>59</volume><issue>2</issue><fpage>184</fpage><lpage>195</lpage><history><date date-type="received" iso-8601-date="2025-02-26"><day>26</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, И.Н. Морева, О.А. Радченко, А.В. Петровская</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, И.Н. Морева, О.А. Радченко, А.В. Петровская</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">И.Н. Морева, О.А. Радченко, А.В. Петровская</copyright-holder><copyright-holder xml:lang="ru">И.Н. Морева, О.А. Радченко, А.В. Петровская</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/0016-6758/article/view/666887">https://transsyst.ru/0016-6758/article/view/666887</self-uri><abstract xml:lang="en"><p id="idm45181323633632">A molecular genetic and karyological study of the fourhorn sculpin <italic>Myoxocephalus quadricornis</italic> (Linnaeus, 1758) was carried out. The karyotype was studied for the first time and the results of Ag-staining of the chromosomes of specimens of the species from the East Siberian Sea are presented. The karyotype of <italic>M. quadricornis</italic> is stable, contains 32 (10 metacentrics, 2 submetacentrics, 20 subtelocentrics) chromosomes, the number of chromosome arms is 44. Nucleolar organizers were found in the telomeric regions of the short arms of two homologous medium-sized subtelocentrics. Variability in the number of nucleolarforming chromosomes and stained blocks of nucleolar organizers was found. Common features in the chromosome sets of <italic>M. quadricornis</italic> and <italic>Megalocottus platycephalus</italic> indicate their greater similarity compared to species of the genus <italic>Myoxocephalus</italic>. The results of the karyological analysis are consistent with the molecular genetic data about the sister relationships between <italic>M. quadricornis</italic> and <italic>Megalocottus platycephalus</italic>. A complex of karyological and molecular-genetic features has been identified that allow one to reliably distinguish <italic>M. quadricornis</italic> from species of the tribe Myoxocephalini and indicate the need for its removal from the genus <italic>Myoxocephalus</italic>.
</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181323631696">Проведено молекулярно-генетическое и кариологическое исследование четырехрогого керчака <italic>Myoxocephalus quadricornis</italic> (Linnaeus, 1758). Впервые изучен кариотип и приведены результаты Ag-окрашивания хромосом экземпляров вида из Восточно-Сибирского моря. Кариотип <italic>M. quadricornis</italic> стабилен, содержит 32 (10 метацентриков, 2 субметацентрика, 20 субтелоцентриков) хромосомы, число хромосомных плеч – 44. Ядрышковые организаторы выявлены в теломерных районах коротких плеч двух гомологичных субтелоцентриков среднего размера. Обнаружена изменчивость по числу ядрышкообразующих хромосом и окрашиваемых блоков ядрышковых организаторов. Общие признаки в хромосомных наборах <italic>M. quadricornis</italic> и <italic>Megalocottus platycephalus</italic> указывают на их более значительную близость по сравнению с видами рода <italic>Myoxocephalus</italic>. Результаты кариологического анализа согласуются с молекулярно-генетическими данными о сестринских отношениях <italic>M. quadricornis</italic> и <italic>Megalocottus platycephalus.</italic> Выявлен комплекс кариологических и молекулярно-генетических признаков, позволяющих надежно отличать <italic>M. quadricornis</italic> от видов трибы Myoxocephalini и свидетельствующих о необходимости его выведения из рода <italic>Myoxocephalus</italic>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>tribe Myoxocephalini</kwd><kwd>karyotype</kwd><kwd>marker chromosomes</kwd><kwd>nucleolar organizers (NOs)</kwd><kwd>mitochondrial DNA</kwd><kwd>genetic differentiation.</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>триба Myoxocephalini</kwd><kwd>кариотип</kwd><kwd>маркерные хромосомы</kwd><kwd>ядрышковые организаторы (ЯО)</kwd><kwd>митохондриальная ДНК</kwd><kwd>генетическая дифференциация.</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Неелов А.В. 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