Characteristics Three large prominent lips, each with a dentigerous ridge, and no interlabia or alae.
Lateral lines are visible grossly.
Males are 15 to 31 cm long and 2 to 4 mm at greatest width. The posterior end is curved ventrad, and the tail is bluntly pointed. Spicules are simple, nearly equal, and measure 2 to 3.5 mm long. Females are 20 to 49 cm long and 3 to 6 mm wide. The vulva is about one third the body length from the anterior end.