Varela-Benavides I, Peña-Santiago R
Departamento de Biología Animal,Biología Vegetal y Ecología,Universidad de Jaén,Campus 'Las Lagunillas' s/n,Edificio B3,23071- Jaén,Spain.
J Helminthol. 2019 Jan;93(1):100-108. doi: 10.1017/S0022149X17001134. Epub 2017 Dec 14.
The new species Metaxonchium toroense n. sp. from natural habitats of Costa Rica is described, including light microscopy (LM), scanning electron microscopy (SEM) and molecular (D2-D3 28S rDNA) analyses. The new species is characterized by its general size, the dimensions and appearance of its lip region, the length of the odontostyle and its fusiform aspect, the length of the neck and its pharyngeal expansion, the reduction of the anterior genital branch to a very short uterine sac without any rudiment of ovary or oviduct, tripartite and non-echinophor posterior uterus, the somewhat posterior vulva position, the length and shape of the caudal region, and the absence of males. Molecular analyses, the first to be performed on a Metaxonchium species, show a close relationship of the new species with representatives of the genera Axonchoides and Syncheilaxonchium.
描述了来自哥斯达黎加自然栖息地的新物种托罗新叉线虫（Metaxonchium toroense n. sp.），包括光学显微镜（LM）、扫描电子显微镜（SEM）和分子（D2-D3 28S rDNA）分析。该新物种的特征在于其总体大小、唇区的尺寸和外观、齿针的长度及其梭形外观、颈部的长度及其咽部扩张、前生殖支减少为非常短的子宫囊且无卵巢或输卵管的任何痕迹、三分且无棘突的后子宫、阴门位置稍靠后、尾区的长度和形状以及无雄性。分子分析是首次对新叉线虫属物种进行的分析，结果表明该新物种与轴线虫属（Axonchoides）和同唇新叉线虫属（Syncheilaxonchium）的代表物种关系密切。
