Molecular phylogenetics and taxonomy of the African mole-rats, genus Cryptomys and the new genus Coetomys Gray, 1864
Molecular phylogenetics and taxonomy of the African mole-rats, genus Cryptomys and the new genus Coetomys Gray, 1864
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DOI：
10.1016/j.ympev.2003.11.004
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发表时间：
2004-06-01
影响因子：
4.1
通讯作者：
Honeycutt, RL
中科院分区：
文献类型：
--
作者：
Ingram, CM;Burda, H;Honeycutt, RL
隐鼠是撒哈拉以南非洲特有的鼹鼠科（哺乳目-啮齿目）中种类最多、分布最广的一个属。在非洲南部、中部和西部的分布范围内，Cryptomys在形态、行为模式和染色体数量方面表现出多样性，从而使该群体的系统分类学复杂化。通过单独和联合分析线粒体12S rRNA和核转甲状腺蛋白基因内含子I，获得了染色体和地理上不同群体的分子系统发育。我们的研究结果表明，隐蝇是由两个不同的单系分支组成的：hottentotus和mechowi。根据我们的分析，我们建议将机甲进化支提升到Coetomys属，保留Cryptomys作为南非hottentotus进化支的总称。这一结论得到了以下方面的支持：(1)基于独立数据集的两个谱系的相互单系性，(2)这些谱系相对于其他属（即Bathyergus和Georychus）的序列差异水平，以及(3)染色体进化模式的不同，其中Cryptomys sensu stricto具有核型保守性（2N = 54），而Coetomys具有高核型多样性（2N = 40-78）。(C) 2003 Elsevier Inc.版权所有。
Cryptomys represents the most speciose and widely distributed genus of the Bathyergidae (Mammalia- Rodentia), a family of mole-rats endemic to sub-Saharan Africa. Throughout its range in southern, central, and western Africa, Cryptomys displays diversity in terms of morphology, patterns of behavior, and chromosome number, thus complicating the systematics of the group. A molecular phylogeny was obtained by separate and combined analyses of the mitochondrial 12S rRNA and intron I of the nuclear transthyretin gene for chromosomally and geographically diverse populations of Cryptomys. Our results show that Cryptomys sensu lato is comprised of two distinct and divergent monophyletic clades: hottentotus and mechowi. Based on our analyses, we propose the elevation of the mechowi clade to the genus Coetomys, retaining Cryptomys as the generic epithet of the South African hottentotus clade. This is supported by: (1) reciprocal monophyly of the two lineages based on independent datasets, (2) the level of sequence divergence observed between these lineages relative to other genera (i.e., Bathyergus and Georychus), and (3) different patterns of chromosomal evolution, with Cryptomys sensu stricto being karyotypically conserved (2N = 54) and Coetomys exhibiting high karyotypic diversity (2N = 40-78). (C) 2003 Elsevier Inc. All rights reserved.