Department of Biology; Faculty of Science; Akdeniz University; Antalya; Turkey.
Department of Biology; Faculty of Art & Science; Gaziantep University; Gaziantep; Turkey.
Zootaxa. 2023 Nov 13;5369(4):576-584. doi: 10.11646/zootaxa.5369.4.6.
We report the comparative examination of the complete mitochondrial genome of the pygmy mole cricket Xya pfaendleri (Orthoptera: Caelifera: Tridactylidae). The mitogenome consists of 13 protein-coding regions, 22 tRNAs, two rRNAs, and one control region, following the gene order of the ancestral pancrustacean mitogenome. The length of the mitogenome in Xya pfaendleri is 15352 bp. The start and stop codons of the protein-coding genes exhibit the general pattern observed in orthopterans. The data indicate that the pattern of gene overlapping/intergenic sequences exhibits a significant phylogenetic signal. A phylogenetic tree inferred using 12 mitogenomes (seven belonging to Tridactylidea, three to Acrididea, and two to Ensifera) confirms the sister group relationship of Acrididea and Tridactylidea. The relationship among the families of Tridactylidea is Cylindrachetidae + (Ripipterygidae + Tridactylidae). The mitogenome sequences of Xya and Tridactylus constitute a single clade, sharing a last common ancestor 94 million years ago, and rendering the first genus paraphyletic. The present preliminary data suggest that we still have much to learn about the evolution and diversity of Tridactylidea.
我们报告了对小鼹蟋蟀（Xya pfaendleri）（直翅目：长角亚目：三锥科）的完整线粒体基因组的比较研究。该线粒体基因组由 13 个蛋白质编码区、22 个 tRNA、2 个 rRNA 和 1 个控制区组成，遵循原泛甲壳动物线粒体基因组的基因顺序。Xya pfaendleri 的线粒体基因组长度为 15352bp。蛋白质编码基因的起始和终止密码子表现出直翅目动物中观察到的一般模式。数据表明，基因重叠/基因间序列的模式表现出显著的系统发育信号。使用 12 个线粒体基因组（7 个属于三锥科，3 个属于蝗总科，2 个属于螽总科）推断的系统发育树证实了蝗总科和三锥科的姐妹群关系。三锥科的科间关系为 Cylindrachetidae + （Ripipterygidae + Tridactylidae）。Xya 和 Tridactylus 的线粒体基因组序列构成一个单系群，共同拥有 9400 万年前的最后共同祖先，导致第一个属为并系。目前的初步数据表明，我们还有很多关于三锥科的进化和多样性需要了解。
