Genus Siphonolaimus De Man, 1893

Diagnosis (emended from Warwick et al. 1998): Siphonolaiminae. Cuticle striated. Buccal cavity containing an axial cuticularized spear-like structure. Six outer labial setae and four cephalic setae situated more or less at the same level, the six always shorter than the four. Amphids circular. One anterior outstretched ovary. Single anterior testis. Gonad always lies to the left of intestine.