Vol 14: Long-branch attraction and the phylogeny of true water bugs Hemiptera: Nepomorpha as estimated from mitochondrial genomes.Reportar como inadecuado



 Vol 14: Long-branch attraction and the phylogeny of true water bugs Hemiptera: Nepomorpha as estimated from mitochondrial genomes.


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This article is from BMC Evolutionary Biology, volume 14.AbstractBackground: Most previous studies of morphological and molecular data have consistently supported the monophyly of the true water bugs Hemiptera: Nepomorpha. An exception is a recent study by Hua et al. BMC Evol Biol 9: 134, 2009 based on nine nepomorphan mitochondrial genomes. In the analysis of Hua et al. BMC Evol Biol 9: 134, 2009, the water bugs in the group Pleoidea formed the sister group to a clade that consisted of Nepomorpha the remaining true water bugs + Leptopodomorpha shore bugs + Cimicomorpha assassin bugs and relatives + Pentatomomorpha stink bugs and relatives, thereby suggesting that fully aquatic hemipterans evolved independently at least twice. Based on these results, Hua et al. BMC Evol Biol 9: 134, 2009 elevated the Pleoidea to a new infraorder, the Plemorpha. Results: Our reanalysis suggests that the lack of support for the monophyly of the true water bugs including Pleoidea by Hua et al. BMC Evol Biol 9: 134, 2009 likely resulted from inadequate taxon sampling. In particular, long-branch attraction LBA between the distant outgroup taxa and Pleoidea, as well as LBA among taxa in the ingroup, made Nepomorpha appear to be polyphyletic. We used three complementary strategies to test and alleviate the effects of LBA: 1 the removal of distant outgroups from the analysis; 2 the addition of closely related outgroups; and 3 the addition of a mitochondrial genome from a second family of Pleoidea. We also performed likelihood-ratio tests to examine the support for monophyly of Nepomorpha with different combinations of taxa included in the analysis. Furthermore, we found that specimens of Helotrephes sp. were misidentified as Paraplea frontalis Fieber, 1844 by Hua et al. BMC Evol Biol 9: 134, 2009. Conclusions: All analyses that included the addition of more taxa significantly and consistently supported the placement of Pleoidea within the Nepomorpha i.e., supported the monophyly of the traditional true water bugs. Our analyses further support a close relationship between Notonectoidea and Pleoidea within Nepomorpha, and the superfamilies Nepoidea, Ochteroidea, Naucoroidea, and Pleoidea are resolved as monophyletic in all trees with strong support. Our results also confirmed that monophyly of Nepomorpha clearly is not refuted by the mitochondrial genome data.



Autor: Li, Teng; Hua, Jimeng; Wright, April M; Cui, Ying; Xie, Qiang; Bu, Wenjun; Hillis, David M

Fuente: https://archive.org/







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