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Article Dans Une Revue Molecular Phylogenetics and Evolution Année : 2006

Systematics of the Chaetognatha under the light of molecular data, using duplicated 18S ribosomal DNA

Résumé

While the phylogenetic position of Chaetognatha has became central to the question of early bilaterian evolution, the internal systematics of the phylum are still not clear. The phylogenetic relationships of the chaetognaths were investigated using newly obtained small subunit ribosomal RNA nuclear 18S (SSU rRNA) sequences from 16 species together with 3 sequences available in GenBank. As previously shown with the large subunit ribosomal RNA 28S gene, two classes of Chaetognatha SSU rRNA gene can be identified, suggesting a duplication of the whole ribosomal cluster; allowing the rooting of one class of genes by another in phylogenetic analyses. Maximum Parsimony, Maximum Likelihood and Bayesian analyses of the molecular data, and statistical tests showed (1) that there are three main monophyletic groups: Sagittidae/Krohnittidae, Spadellidae/Pterosagittidae, and Eukrohniidae/Heterokrohniidae, (2) that the group of Aphragmophora without Pterosagittidae (Sagittidae/Krohnittidae) is monophyletic, (3) the Spadellidae/Pterosagittidae and Eukrohniidae/Heterokrohniidae families are very likely clustered, (4) the Krohnittidae and Pterosagittidae groups should no longer be considered as families as they are included in other groups designated as families, (5) suborder Ctenodontina is not monophyletic and the Flabellodontina should no longer be considered as a suborder, and (6) the Syngonata/Chorismogonata and the Monophragmophora/Biphragmophora hypotheses are rejected. Such conclusions are considered in the light of morphological characters, several of which are shown to be prone to homoplasy.
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hal-00093729 , version 1 (14-11-2022)

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Daniel Papillon, Yvan Perez, Xavier Caubit, Yannick Le Parco. Systematics of the Chaetognatha under the light of molecular data, using duplicated 18S ribosomal DNA. Molecular Phylogenetics and Evolution, 2006, 38 (3), pp.621-634. ⟨10.1016/j.ympev.2005.12.004⟩. ⟨hal-00093729⟩
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