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"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "The chromosomes of the Didelphidae (Marsupialia) and their evolutionary significance", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "5223634", "url": "https://pubs.usgs.gov/publication/5223634" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 5223634 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1111/j.1095-8312.1977.tb00265.x", "url": "https://doi.org/10.1111/j.1095-8312.1977.tb00265.x" } ], "journal": { "@type": "Periodical", "name": "Biological Journal of the Linnean Society", "volumeNumber": "9", "issueNumber": "2" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Biological Journal of the Linnean Society" } ], "datePublished": "1977", "dateModified": "2023-08-28", "abstract": "One hundred and seventy-seven specimens of American didelphids, representing 9 genera and 22 species have been studied for their chromosomal constitution. Didelphids are very conservative in chromosomal complements. All of the studied species can be sorted into one of three kinds of karyotypes: 2n= 14 (three species of\u00a0Didelphis,\u00a0one of\u00a0Lutreolina,\u00a0two of\u00a0Philander,\u00a0and one of\u00a0Chironectes), 2n =\u00a014 (eight species of\u00a0Marmosa,\u00a0one of\u00a0Metachirus,\u00a0three of\u00a0Caluromys,\u00a0and one of\u00a0Dromiciops),\u00a0and 2n= 18 (three species of\u00a0Monodelphis).\u00a0These karyotypes are stable, showing only minor variations within each basic pattern. It is concluded that chromosomals evolution in the Didelphidae proceededs from low numbers to higher numbers by a process of centromeric fissioning complemented by some pericentric inversions and/or translocations. The pattern of karyotypic stability is consistent with bradytely at the organismic level of evolution. 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