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      The Mitochondrial Genome of Amara aulica (Coleoptera, Carabidae, Harpalinae) and Insights into the Phylogeny of Ground Beetles

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          Abstract

          Carabidae are one of the most species-rich families of beetles, comprising more than 40,000 described species worldwide. Forty-three complete or partial mitochondrial genomes (mitogenomes) from this family have been published in GenBank to date. In this study, we sequenced a nearly complete mitogenome of Amara aulica (Carabidae), using a next-generation sequencing method. This mitogenome was 16,646 bp in length, which encoded the typical 13 mitochondrial protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes, and a putative control region. Combining with the published mitogenomes of Carabidae and five outgroup species from Trachypachidae, Gyrinidae and Dytiscidae, we performed phylogenetic estimates under maximum likelihood and Bayesian inference criteria to investigate the phylogenetic relationships of carabid beetles. The results showed that the family Carabidae was a non-monophyletic assemblage. The subfamilies Cicindelinae, Elaphrinae, Carabinae, Trechinae and Harpalinae were recovered as monophyletic groups. Moreover, the clade (Trechinae + (Brachininae + Harpalinae)) was consistently recovered in all analyses.

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          TranslatorX: multiple alignment of nucleotide sequences guided by amino acid translations

          We present TranslatorX, a web server designed to align protein-coding nucleotide sequences based on their corresponding amino acid translations. Many comparisons between biological sequences (nucleic acids and proteins) involve the construction of multiple alignments. Alignments represent a statement regarding the homology between individual nucleotides or amino acids within homologous genes. As protein-coding DNA sequences evolve as triplets of nucleotides (codons) and it is known that sequence similarity degrades more rapidly at the DNA than at the amino acid level, alignments are generally more accurate when based on amino acids than on their corresponding nucleotides. TranslatorX novelties include: (i) use of all documented genetic codes and the possibility of assigning different genetic codes for each sequence; (ii) a battery of different multiple alignment programs; (iii) translation of ambiguous codons when possible; (iv) an innovative criterion to clean nucleotide alignments with GBlocks based on protein information; and (v) a rich output, including Jalview-powered graphical visualization of the alignments, codon-based alignments coloured according to the corresponding amino acids, measures of compositional bias and first, second and third codon position specific alignments. The TranslatorX server is freely available at http://translatorx.co.uk.
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            A comprehensive phylogeny of beetles reveals the evolutionary origins of a superradiation.

            Beetles represent almost one-fourth of all described species, and knowledge about their relationships and evolution adds to our understanding of biodiversity. We performed a comprehensive phylogenetic analysis of Coleoptera inferred from three genes and nearly 1900 species, representing more than 80% of the world's recognized beetle families. We defined basal relationships in the Polyphaga supergroup, which contains over 300,000 species, and established five families as the earliest branching lineages. By dating the phylogeny, we found that the success of beetles is explained neither by exceptional net diversification rates nor by a predominant role of herbivory and the Cretaceous rise of angiosperms. Instead, the pre-Cretaceous origin of more than 100 present-day lineages suggests that beetle species richness is due to high survival of lineages and sustained diversification in a variety of niches.
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              Deciphering ancient rapid radiations.

              A deeper phylogenetic understanding of ancient patterns of diversification would contribute to solving many problems in evolutionary biology, yet many of these phylogenies remain poorly resolved. Ancient rapid radiations pose a major challenge for phylogenetic analysis for two main reasons. First, the pattern to be deciphered, the order of divergence among lineages, tends to be supported by small amounts of data. Second, the time since divergence is large and, thus, the potential for misinterpreting phylogenetic information is great. Here, we review the underlying causes of difficulty in determining the branching patterns of diversification in ancient rapid radiations, and review novel data exploration tools that can facilitate understanding of these radiations.
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                Author and article information

                Journal
                Genes (Basel)
                Genes (Basel)
                genes
                Genes
                MDPI
                2073-4425
                09 February 2020
                February 2020
                : 11
                : 2
                : 181
                Affiliations
                [1 ]College of Plant Protection, Henan Agricultural University, Zhengzhou 450002, China; zhenya0371@ 123456163.com (Z.L.); lixinxin412@ 123456126.com (X.L.); xinmingyin@ 123456hotmail.com (X.Y.)
                [2 ]Technical Center, Zhengzhou Customs District, Zhengzhou 450002, China; huijit@ 123456tom.com
                Author notes
                [* ]Correspondence: songnan@ 123456henau.edu.cn
                Article
                genes-11-00181
                10.3390/genes11020181
                7074353
                32050506
                79a7a17d-ec40-43e4-ae41-6f7051b66153
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 31 December 2019
                : 06 February 2020
                Categories
                Article

                ground beetle,mitogenome,next-generation sequencing,phylogeny

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