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).