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A molecular phylogenetic approach to Longidoridae (Nematoda: Dorylaimida)

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For more content, see Nematologica.

The Longidoridae are a group of ectoparasitic nematodes including two subfamilies and six genera with hundreds of species. Sequences of the D2 and D3 expansion region of the large subunit (LSU) rRNA nuclear gene were amplified and used to reconstruct the phylogeny of longidorids. Phylogenetic analyses with maximum parsimony (MP), maximum likelihood (ML) and Bayesian inference (BI) were performed with one outgroup taxon and 62 longidorid sequences. Confidence of inferred clades was assessed by non-parametric bootstrapping for MP and Bayesian posterior probability for ML. All analyses placed Paralongidorus species as an inner group within the otherwise monophyletic genus Longidorus. The genus Xiphinema, except for X. americanum-group species, was placed as the sister group of Longidorus with strong support from the ML and BI analyses. The X. americanum-group was strongly supported as an exclusive clade to other genus Xiphinema species. The position of the Xiphidorus clade was not well resolved and the phylogenetic analyses did not support it as a sister group to Longidorus as previously inferred from morphology. Secondary structure models were constructed for the D2/D3 region of LSU rRNA for all studied species. It was found that sequence-based and structural morphometric rRNA phylogenies were incongruent.


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