(Van Beneden, 1838)
Body oval, skin semi-transparent, usually pigmented. Wings well-developed, posterior footlobe long. Rather long body with posterior gill with well-developed long fringes, and short lateral gill with fringes. Long sucker arms, each with 6-7 suckers, central 4 largest. Hook sacs long with 40 slender hooks. Hooks on spirally coiled appendage. Radula formula: 7-0-7. Body length 20 mm.