New data of three rare belondirid species (Nematoda, Dorylaimida, Belondiridae) from Vietnam, with the first record and description of the male of Oxybelondira paraperplexa Ahmad & Jairajpuri, 1979

Three rare nematode species of the family Belondiridae, originally described from and only known to occur in India are recorded for the first time in Vietnam: Axonchium thoubalicum, Belondira murtazai and Oxybelondira paraperplexa. It is the first report of these three genera in this country. The three species are described, including new morphological data, morphometrics and light microscope pictures. The male of O. paraperplexa is collected and described for the first time. It is characterized by its 1.54 mm long body, ad-cloacal pair of genital papillae situated at 9.0 µm from the cloacal aperture, only one ventromedian supplement located at 15 µm from the ad-cloacal pair within the range of spicules, spicules slightly curved ventrad and 42 µm long (7 times as long as wide and 2 times as long as cloacal body diameter), and tail 100 µm long (c = 15, c’ = 5) and similar to that of the female.

首次在越南记录了三种来自贝伦迪里科（Belondiridae）家族的稀有线虫物种，这些物种最初描述自并仅知存在于印度：Axonchium thoubalicum、Belondira murtazai以及Oxybelondira paraperplexa。这是这三种属在该国的首次报道。本文对这三种物种进行了描述，包括新的形态学数据、形态计量学和光学显微镜图片。O. paraperplexa的雄性标本首次收集并描述。其特征为：体长1.54毫米，生殖乳突对位于距肛门开口9.0微米的腺-肛门附近，仅在刺的范围内有一个位于腺-肛门对15微米处的腹中线补充，刺略向腹面弯曲，长度为42微米（宽度的7倍，直径的2倍），尾部长度为100微米（c=15，c'=5），与雌性相似。