Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05, České Budějovice, Czech Republic.
Molecular Taxonomy Laboratory, Department of Zoology, Chaudhary Charan Singh University, Meerut, Uttar Pradesh, 25004, India.
Syst Parasitol. 2022 Oct;99(5):647-657. doi: 10.1007/s11230-022-10053-5. Epub 2022 Jul 13.
One new and one already known species of nematodes are described based on specimens collected from synbranchiform fishes of the River Ganga, India, in 2021 and 2022. Pseudocapillaria (Discocapillaria) trilobularis n. sp. (Capillariidae) from the intestine of cuchia Monopterus cuchia (Hamilton) (Synbranchidae) is mainly characterised by the presence of the large ventral postcloacal lobe in the male, the spicule length 351 µm, eggs size 60-69 × 30-36 µm (with protruding polar plugs) and by the body length (male 10.50 mm, females 11.02-12.44 mm). It is the fourth species of this genus recorded from fishes in India. The species Heliconema alatum (Majumdar, 1965) (Physalopteridae) is resurrected. This nematode is redescribed from specimens collected from the intestine of zig-zag eel Mastacembelus armatus (Lacepède) (Mastacembelidae). The examination by SEM revealed some previously not reported morphological features in this nematode species, e.g., the presence of cephalic papillae or a lateroterminal depression and two inner flat dorsoventral teeth on each pseudolabium. Based on these findings, H. monopteri Moravec, Chaudhary & Singh, 2019 is considered a junior synonym of H. alatum.
本文基于 2021 年和 2022 年从印度恒河的合鳃鱼中采集的标本，描述了一种新的和一种已知的线虫物种。从合鳃鱼 Monopterus cuchia (Hamilton)（合鳃科）的肠道中采集到的伪毛首线虫（Discocapillaria）三叶形新种（Capillariidae），主要特征是雄虫具有大的腹后肛前叶、体长 351 µm、卵大小 60-69 × 30-36 µm（带有突出的极栓）和体长达 10.50 毫米（雄虫），11.02-12.44 毫米（雌虫）。这是该属在印度鱼类中记录的第四个物种。复活了 Heliconema alatum (Majumdar, 1965)（Physalopteridae）。从 zig-zag 鳗鱼 Mastacembelus armatus (Lacepède)（Mastacembelidae）的肠道中采集到的标本对这种线虫进行了重新描述。通过 SEM 检查，发现了该线虫物种以前未报告的一些形态特征，例如，存在头乳突或侧端凹陷和每个假侧板上的两个内扁背腹齿。基于这些发现，H. monopteri Moravec, Chaudhary & Singh, 2019 被认为是 H. alatum 的一个次同物异名。
