25 November 2008 Phylogenetic Relationships of Basal Hexapods Reconstructed from Nearly Complete 18S and 28S rRNA Gene Sequences
Yan Gao, Yun Bu, Yun-Xia Luan
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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.

Yan Gao, Yun Bu, and Yun-Xia Luan "Phylogenetic Relationships of Basal Hexapods Reconstructed from Nearly Complete 18S and 28S rRNA Gene Sequences," Zoological Science 25(11), 1139-1145, (25 November 2008). https://doi.org/10.2108/zsj.25.1139
Received: 28 May 2008; Accepted: 1 August 2008; Published: 25 November 2008
18S rRNA gene
28S rRNA gene
molecular phylogeny
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