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<p>This study presents, for the first time, a detailed cytogenetic description and comparative analysis of the karyotypes of the Manchurian white-toothed shrew <i>Crocidura shantungensis</i> Miller, 1901 and Ussuri white-toothed shrew <i>Crocidura lasiura</i> Dobson, 1890 from the Russian Far East. These sympatric species represent the different monophyletic groups of 40-chromosome white-toothed shrews. The GTG-banded karyotypes of <i>C. shantungensis</i> and <i>C. lasiura</i> are homologous to the previously described karyotypes of their groups, <i>C. suaveolens</i> and <i>C. dsinezumi</i> respectively. Six apomorphic chromosomes accompanied the formation of the <i>C. dsinezumi – C. lasiura</i> group, while species of the <i>C. suaveolens</i> group are characterized by nine chromosomal markers. A comparative analysis of the karyotypes of white-toothed shrews and <i>Suncus murinus</i> from the genus <i>Suncus</i>, closely related to <i>Crocidura</i>, revealed the presence of 10 pairs of plesiomorphic chromosomes. Seven of these have been conserved since the divergence of these genera approximately 6.8&#xa0;million years ago (MYA), and 3 pairs of chromosomes since the divergence of both groups approximately 5.4 MYA. The larger number of ancestral chromosomes and fewer chromosomal rearrangements observed in the karyotypes of the <i>C. dsinezumi</i> - <i>C. lasiura</i> group indicate a lower rate of chromosomal evolution compared to the <i>C. suaveolens</i> group.</p>

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Comparative analysis of karyotypes of white-toothed shrews Crocidura lasiura and Crocidura shantungensis (Eulipotyphla, Mammalia)

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Larisa S. Biltueva,
  • Natalya A. Lemskaya,
  • Alexei V. Abramov,
  • Vladimir V. Platonov,
  • Natalya A. Serdyukova

摘要

This study presents, for the first time, a detailed cytogenetic description and comparative analysis of the karyotypes of the Manchurian white-toothed shrew Crocidura shantungensis Miller, 1901 and Ussuri white-toothed shrew Crocidura lasiura Dobson, 1890 from the Russian Far East. These sympatric species represent the different monophyletic groups of 40-chromosome white-toothed shrews. The GTG-banded karyotypes of C. shantungensis and C. lasiura are homologous to the previously described karyotypes of their groups, C. suaveolens and C. dsinezumi respectively. Six apomorphic chromosomes accompanied the formation of the C. dsinezumi – C. lasiura group, while species of the C. suaveolens group are characterized by nine chromosomal markers. A comparative analysis of the karyotypes of white-toothed shrews and Suncus murinus from the genus Suncus, closely related to Crocidura, revealed the presence of 10 pairs of plesiomorphic chromosomes. Seven of these have been conserved since the divergence of these genera approximately 6.8 million years ago (MYA), and 3 pairs of chromosomes since the divergence of both groups approximately 5.4 MYA. The larger number of ancestral chromosomes and fewer chromosomal rearrangements observed in the karyotypes of the C. dsinezumi - C. lasiura group indicate a lower rate of chromosomal evolution compared to the C. suaveolens group.