Abstract

The species number has been strikingly increasing in recent current works on Ethiopian endemic rodents, which to a great extent is due to genomic studies including the karyotype discoveries. Here, the diploid number 2N = 52 is defined anew for the genus Stenocephalemys, endemic to the Ethiopian Highlands, where four karyotypes with 2N values of 54, 50 and 46 were so far described for four taxa. The new karyotype (S. “pseudogriseicauda”) combines into a nearly full series with other 2Ns (except the not yet found 2N = 48) within the genus and shows one interspecific chromosome rearrangement associated with the tandem fusion, in the direction 2N = 54 to 2N = 52. Together with the earlier detection of tandem fusions between karyotypes with 2N = 46 (S. albipes) and 2N = 54 (S. albocaudatus, S. griseicauda), this rodent taxonomic group presents an interesting case for the phenomenon of karyotypic orthoselection in an intrageneric phyletic line via the reoccurence of such characteristic chromosomal rearrangements as tandem fusions.

中文翻译：

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埃塞俄比亚地方性啮齿动物进化中的串联融合。

摘要

在最近有关埃塞俄比亚地方性啮齿类动物的最新工作中，物种数量急剧增加，这在很大程度上归因于包括核型发现在内的基因组研究。在这里，二倍体数2 N = 52被重新定义为埃塞俄比亚高地特有的Stenocephalemys属，其中迄今已对四个分类群描述了2个N 2分别为54、50和46的核型。新的核型（S. “ pseudogriseicauda ”）与该属内的其他2 Ns（除了尚未发现的2 N = 48 ）组合成几乎完整的序列，并显示了与串联融合相关的一种种间染色体重排2 N= 54〜2 Ñ与2早期检测核型之间串联融合物= 52一起Ñ = 46（S. albipes）和2 Ñ = 54（S. albocaudatus，S. griseicauda），这种啮齿类动物分类组提出了一个有趣通过重新出现诸如串联融合的特征性染色体重排，在种系内系统发育系中发生核型正骨弯曲现象的案例。