Summary A new nematode species, Heliconema monopteri n. sp. (Physalopteridae), is described from the stomach and intestine of the freshwater fish Monopterus cuchia (Hamilton) (Synbranchidae) in Bijnor district, Uttar Pradesh, India. It is mainly characterized by the lengths of spicules (468 – 510 µm and 186 – 225 µm), the postequatorial vulva without elevated lips, the presence of pseudolabial lateroterminal depressions and by the number and arrangement of caudal papillae. This is the first representative of the genus reported from a synbranchiform fish. Another new congeneric species, Heliconema pisodonophidis n. sp. is established based on a re-examination of nematodes previously reported as H. longissimum (Ortlepp, 1922) from Pisodonophis boro (Hamilton) (Ophichthidae) in Thailand; ovoviviparity in this species is a unique feature among all physalopterids. Heliconema hamiltonii Bilqees et Khanum, 1970 is designated as a species dubia and the nematodes previously reported as H. longissimum from Mastacembelus armatus (Lacépède) in India are considered to belong to H. kherai Gupta et Duggal, 1989. A key to species of Heliconema Travassos, 1919 is provided.

中文翻译：

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单翅目螺旋藻 sp. （线虫：Physalopteridae）来自印度的 Monopterus cuchia（Hamilton）（Osteichthyes：Synbranchidae），并附有 Heliconema spp 分类学的注释。

总结 一种新的线虫物种 Heliconema monopteri n。sp. (Physalopteridae)，来自印度北方邦比诺区的淡水鱼 Monopterus cuchia (Hamilton) (Synbranchidae) 的胃和肠。它的主要特征是针状体的长度（468-510μm和186-225μm），没有升高的唇部的赤道后外阴，存在假阴唇外侧末端凹陷以及尾部乳头的数量和排列。这是从同枝状鱼报道的该属的第一个代表。另一个新的同类物种 Heliconema pisodonophidis n。sp. 是基于对先前报告为来自泰国 Pisodonophis boro (Hamilton) (Ophichthidae) 的 H. longissimum (Ortlepp, 1922) 的线虫的重新检查而建立的；该物种的卵胎生是所有翼翅目中的一个独特特征。Heliconema hamiltonii Bilqees et Khanum, 1970 被指定为一个物种 dubia，之前报道的来自印度 Mastacembelus armatus (Lacépède) 的 H. longissimum 线虫被认为属于 H. kherai Gupta et Duggal, 1989。 Heliconema 物种的关键提供了 Travassos，1919 年。