Molecular phylogeny of Megalobatrachonema (Nematoda: Ascaridida), with description of a new species based on morphological and molecular evidence.

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ID: 79517
2020
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Abstract
Species of MegalobatrachonemaYamaguti, 1941 (Ascaridida: Cosmocercoidea) are important nematode parasites in amphibians and reptiles. However, the phylogenetic relationship of its included two subgenera Megalobatrachonema and Chabaudgolvania remains unclear. In the present study, a new species of Megalobatrachonema, M. (Chabaudgolvania) wangi sp. nov., was described based on the specimens collected from the lesser spiny frog Quasipaa exilispinosa (Liu & Hu) (Amphibia: Anura) in China. The ribosomal [large ribosomal DNA (28S) and internal transcribed spacer (ITS1-5.8S-ITS2)] and mitochondrial [12S small subunit ribosomal DNA and cytochrome c oxidase subunit 1 (cox1)] target regions of the new species and M. (Chabaudgolvania) terdentatum, together with the 12S region of M. (Megalobatrachonema) hainanensis, were amplified and sequenced for molecular identification and phylogeny. Moreover, in order to clarify the systematic position of the new species and the phylogenetic relationship of the two subgenera Megalobatrachonema and Chabaudgolvania, phylogenetic analyses based on 28S + ITS1-5.8S-ITS2 + 12S sequence data were performed using maximum likelihood (ML) inference and Bayesian inference (BI). The molecular phylogenetic results conflicted with the current classification and challenged the validity of the subgenus Chabaudgolvania, that should be a synonym of the subgenus Megalobatrachonema. The presence or absence of valves in the oesophageal bulb as a key criterion for delimitation of the two subgenera Megalobatrachonema and Chabaudgolvania seems to be unreliable.
Reference Key
chen2020molecularinfection Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Chen, Hui-Xia;Zhang, Lu-Ping;Sinsch, Ulrich;Scheid, Patrick;Balczun, Carsten;Li, Liang;
Journal Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases
Year 2020
DOI
S1567-1348(20)30004-6
URL
Keywords
phylogeny systematics frog ascaridida cosmocercoidea genetic data

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