We examined the distribution of genes for major ribosomal RNAs (rDNA) on holokinetic chromosomes of 74 species belonging to 19 genera of scorpions from the family Buthidae using fluorescence in situ hybridization (FISH). Our analysis revealed differences between the two main evolutionary lineages within the family. The genera belonging to the ‘Buthus group’, with a proposed Laurasian origin, possess one pair of rDNA mainly in an interstitial position, with the only exceptions being the terminal location found in some Hottentotta and Buthacus species, possibly as a result of chromosome fissions. All the remaining buthid ‘groups’ possess rDNA found strictly in a terminal position. However, the number of signals may increase from an ancestral state of one pair of rDNA loci to up to seven signals in Reddyanus ceylonensis Kovařík et al., 2016. Despite the differences in evolutionary dynamics of the rDNA clusters between the ‘Buthus group’ and other lineages investigated, we found a high incidence of reciprocal translocations and presence of multivalent associations during meiosis in the majority of the genera studied. These phenomena seem to be typical for the whole family Buthidae.

中文翻译：

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rhid蝎子染色体上的rDNA簇的进化动力学（Chelicerata：Arachnida）

我们使用荧光原位杂交（FISH）研究了属于Buthidae蝎子19属的74个物种的全动染色体上主要核糖体RNA（rDNA）的基因分布。我们的分析揭示了家族中两个主要进化谱系之间的差异。属于“ Buthus族”的属，具有拟议的劳拉斯血统，主要在间质位置具有一对rDNA，唯一的例外是在某些Hottentotta和Buthacus中发现的末端位置物种，可能是由于染色体裂变造成的。所有其余的buthid“基团”都具有严格位于末端位置的rDNA。然而，信号的数目可以在从一对的rDNA基因座的一个祖先状态增加至多达七个信号Reddyanus ceylonensis科瓦里克等。，2016年。尽管“ Buthus组”和其他研究谱系之间的rDNA簇进化动力学存在差异，但我们发现在大多数研究属中，减数分裂过程中相互易位和多价缔合的存在率很高。这些现象似乎是整个But蛾科的典型现象。