Genus Halenchus
Anguindae.
Labial region slightly offset and narrower than body. Corpus without distinct median bulb, valveless. Esophageal glands a long overlapping lobe. Excretory duct wide. Oocytes in one/two rows. Caudal alae short, adanal. Tail of both sexes with hooked tip.

Marine nematodes; form galls on seaweeds (Ascophyllum, Fucus).