Genus Helluoherpia Handl & Büchinger, 1996

Type species. Helluoherpia aegiri Handl & Büchinger, 1996, Norway 185–250 m depth .

Diagnosis. With leaf-shaped scales and solid acicular sclerites. Monoserial radula with three denticles. With common atrio-buccal cavity. Ventrolateral foregut glands as two long simple ducts with inner musculature and extraepithelial gland cells (Type A) opening in the anterior region of the ducts; Helluoherpia - type. Without dorsoterminal sensory organ. Without respiratory folds. Unpaired secondary genital opening. Without copulatory stylets.