Phylogenetic Relationships of Basal Hexapods Reconstructed from Nearly Complete 18S and 28S rRNA Gene Sequences
Phylogenetic Relationships of Basal Hexapods Reconstructed from Nearly Complete 18S and 28S rRNA Gene Sequences
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DOI：
10.2108/zsj.25.1139
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发表时间：
2008-11-01
影响因子：
0.9
通讯作者：
Luan, Yun-Xia
中科院分区：
文献类型：
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作者：
Gao, Yan;Bu, Yun;Luan, Yun-Xia
本研究结合近完整的28 S和18 S rRNA基因序列（>4100 nt），探讨了基足类（原尾目、弹尾目和双尾目）的系统发育关系。它对更多的28 S基因进行了测序，以扩展该实验室以前的一项研究，该研究使用18 S加上28 S基因的一小部分。16种基底六足动物，5种昆虫，6种甲壳动物，2种多足动物和2种螯肢动物被列入分析。用最大似然法、贝叶斯分析和LogDet-transformed距离的最小进化分析构建树。结果表明：（1）六足类为单系，嵌套于并系甲壳动物中，六足类可分为内颚类[弹尾目+Nonoculata（原尾目+双尾目）]和昆虫类（=外颚类），但Nonoculata分支因其核苷酸组成具有很强的非平稳性而必须谨慎接受。(2)在双尾目中，Campodeoidea和Japygoidea的单系性分别得到支持，并且所有方法都将Projapygoidea和Japygoidea统一起来。(3)在原尾目中，Sinentomidae是Acerentomata的姐妹群。(4)在弹尾目中，弹尾目的现代分类等级（Poduromorpha，Entomobryomorpha，Symphypleona和Neelipleona）得到了确认。
This study combined nearly complete 28S and 18S rRNA gene sequences (>4100 nt long) to investigate the phylogenetic relationships of basal hexapods (Protura, Collembola, and Diplura). It sequenced more 28S genes, to expand on a previous study from this lab that used 18S plus only a tiny part of the 28S gene. Sixteen species of basal hexapods, five insects, six crustaceans, two myriapods, and two chelicerates were included in the analyses. Trees were constructed with maximum likelihood, Bayesian analysis, and minimum-evolution analysis of LogDet-transformed distances. All methods yielded consistent results: (1) Hexapoda was monophyletic and nested in a paraphyletic Crustacea, and Hexapoda was divided into Entognatha [Collembola+Nonoculata (Protura plus Diplura)] and Insecta (=Ectognatha), but the Nonoculata clade must be accepted with caution because of its strong nonstationarity of nucleotide composition. (2) Within Diplura, the monophyly of Campodeoidea and of Japygoidea were supported respectively, and all methods united Projapygoidea with Japygoidea. (3) Within Protura, Sinentomidae was the sister group to Acerentomata. (4) Within Collembola, the modern taxonomical hierarchy of Collembola (Poduromorpha, Entomobryomorpha, Symphypleona and Neelipleona) was confirmed.