The complete mitochondrial genome of Acanthacorydalis orientalis （McLachlan） was determined and analyzed （GenBank accession number： KF840564）. This paper represents the first mitochondrial （mt） genome of the do...The complete mitochondrial genome of Acanthacorydalis orientalis （McLachlan） was determined and analyzed （GenBank accession number： KF840564）. This paper represents the first mitochondrial （mt） genome of the dobsonfly genus Acanthacorydalis. The mt genome is a typical circular DNA of 15 753 bp composed of 37 genes with an A＋T content of 76.7%. It has an ancestral gene arrangement of the insect mt genomes. Eleven of the 13 PCGs start with codon ATT and ATG,while several exceptions such as ATA and TTG respectively for atp 8 and nad 1 are also present. Five protein-coding genes end with a single T, while others have a termination codon of TAA or TAG. Most tRNAs are folded into the typical clover-leaf structure except for the trnS 1 whose dihydrouridine arm was a simple loop. The secondary structure of rrnl consists of five structural domains and 50 helices, while the rrns includes three domains and 34 helices. The control region has a stretches of Ts with a length of 22 bp but lacks obvious tandem repeat region. Both Bayesian inference and maximum likelihood （ML） analyses, based on all 13 protein-coding genes and two rRNA genes of the mt genomes, confirm the monophyly of Corydalinae and suggest that Acanthacorydalis, together with Corydalus, which is an endemic dobsonfly genus from the New World, belong to a monophyletic lineage.展开更多
Unraveling the phylogeographic histories of species remains a key endeavor for comprehending the evolutionary processes contributing to the rich biodiversity and high endemism found in East Asia.In this study,we explo...Unraveling the phylogeographic histories of species remains a key endeavor for comprehending the evolutionary processes contributing to the rich biodiversity and high endemism found in East Asia.In this study,we explored the phylogeographic patterns and demographic histories of three endemic fishfly and dobsonfly species(Neochauliodes formosanus,Protohermes costalis,and Neoneuromus orientalis)belonging to the holometabolan order Megaloptera.These species,which share a broad and largely overlapping distribution,were analyzed using comprehensive mitogenomic data.Our findings revealed a consistent influence of vicariance on the population isolation of Neoc.formosanus and P.costalis between Hainan,Taiwan,and the East Asian mainland during the early Pleistocene,potentially hindering subsequent colonization of the later diverged Neon.orientalis to these islands.Additionally,we unveiled the dual function of the major mountain ranges in East Asia,serving both as barriers and conduits,in shaping the population structure of all three species.Notably,we demonstrated that these co-distributed species originated from Southwest,Southern,and eastern Central China,respectively,then subsequently migrated along multi-directional routes,leading to their sympatric distribution on the East Asian mainland.Furthermore,our results highlighted the significance of Pleistocene land bridges along the eastern coast of East Asia in facilitating the dispersal of mountain-dwelling insects with low dispersal ability.Overall,this study provides novel insight into the synergistic impact of Pleistocene geological and climatic events in shaping the diversity and distribution of aquatic insects in East Asia.展开更多
基金supported by the National Natural Science Foundation of China(31322051,31320103902)the Foundation for the Author of National Excellent Doctoral Dissertation of PR China(201178)
文摘The complete mitochondrial genome of Acanthacorydalis orientalis （McLachlan） was determined and analyzed （GenBank accession number： KF840564）. This paper represents the first mitochondrial （mt） genome of the dobsonfly genus Acanthacorydalis. The mt genome is a typical circular DNA of 15 753 bp composed of 37 genes with an A＋T content of 76.7%. It has an ancestral gene arrangement of the insect mt genomes. Eleven of the 13 PCGs start with codon ATT and ATG,while several exceptions such as ATA and TTG respectively for atp 8 and nad 1 are also present. Five protein-coding genes end with a single T, while others have a termination codon of TAA or TAG. Most tRNAs are folded into the typical clover-leaf structure except for the trnS 1 whose dihydrouridine arm was a simple loop. The secondary structure of rrnl consists of five structural domains and 50 helices, while the rrns includes three domains and 34 helices. The control region has a stretches of Ts with a length of 22 bp but lacks obvious tandem repeat region. Both Bayesian inference and maximum likelihood （ML） analyses, based on all 13 protein-coding genes and two rRNA genes of the mt genomes, confirm the monophyly of Corydalinae and suggest that Acanthacorydalis, together with Corydalus, which is an endemic dobsonfly genus from the New World, belong to a monophyletic lineage.
基金supported by the National Natural Science Foundation of China(32170448,32130012,32300374)Beijing Natural Science Foundation(5212011)2115 Talent Development Program of China Agricultural University,and National Animal Collection Resource Center,China。
文摘Unraveling the phylogeographic histories of species remains a key endeavor for comprehending the evolutionary processes contributing to the rich biodiversity and high endemism found in East Asia.In this study,we explored the phylogeographic patterns and demographic histories of three endemic fishfly and dobsonfly species(Neochauliodes formosanus,Protohermes costalis,and Neoneuromus orientalis)belonging to the holometabolan order Megaloptera.These species,which share a broad and largely overlapping distribution,were analyzed using comprehensive mitogenomic data.Our findings revealed a consistent influence of vicariance on the population isolation of Neoc.formosanus and P.costalis between Hainan,Taiwan,and the East Asian mainland during the early Pleistocene,potentially hindering subsequent colonization of the later diverged Neon.orientalis to these islands.Additionally,we unveiled the dual function of the major mountain ranges in East Asia,serving both as barriers and conduits,in shaping the population structure of all three species.Notably,we demonstrated that these co-distributed species originated from Southwest,Southern,and eastern Central China,respectively,then subsequently migrated along multi-directional routes,leading to their sympatric distribution on the East Asian mainland.Furthermore,our results highlighted the significance of Pleistocene land bridges along the eastern coast of East Asia in facilitating the dispersal of mountain-dwelling insects with low dispersal ability.Overall,this study provides novel insight into the synergistic impact of Pleistocene geological and climatic events in shaping the diversity and distribution of aquatic insects in East Asia.
