Newton L A, Chilton N B, Beveridge I, Gasser R B
Department of Veterinary Science, The University of Melbourne, Werribee, Victoria, Australia.
Int J Parasitol. 1998 Nov;28(11):1781-9. doi: 10.1016/s0020-7519(98)00144-1.
The present study characterised seven species of the Chabertiidae (Nematoda: Strongyloidea) belonging to either the subfamily Oesophagostominae (Oesophagostomum radiatum, Oesophagostomum venulosum, Oesophagostomum dentatum, Oesophagostomum quadrispinulatum, Oesophagostomum columbianum, Oesophagostomum bifurcum) or to the subfamily Chabertiinae (Chabertia ovina) by their second internal transcribed spacer rDNA sequence, assessed the extent of intraspecific variation and interspecific differences in the sequence, and inferred the phylogenetic relationship of C. ovina with respect to members of the Oesophagostominae. In both the phenetic and cladistic analyses of the sequence data, Chabertia was nested within Oesophagostomum, suggesting either that the species examined represent members of the same genus, or alternatively, that Oesophagostomum may represent more than one genus.
本研究通过第二内部转录间隔区rDNA序列对属于管圆线虫亚科（辐射食道口线虫、微管食道口线虫、有齿食道口线虫、四棘食道口线虫、哥伦比亚食道口线虫、分岔食道口线虫）或夏伯特线虫亚科（绵羊夏伯特线虫）的7种夏伯特科线虫（线虫纲：圆线虫总科）进行了特征分析，评估了该序列的种内变异程度和种间差异，并推断了绵羊夏伯特线虫相对于管圆线虫亚科成员的系统发育关系。在对序列数据的表型分析和分支分析中，夏伯特线虫均嵌套在食道口线虫属内，这表明所研究的物种要么代表同一属的成员，要么食道口线虫属可能代表不止一个属。
