Family Desmopteridae Chun, 1899
The Desmopteridae is composed of one genus only.
The shell is completely lost in Cymbuliidae and Desmopteridae. In Cymbuliidae the visceral mass is surrounded by a secondary cartilaginous-like slipper beset with spines or tubercles. In Desmopteridae the slipper-like pseudoconch is absent. The wings, derived from the foot, form one continuous disc in which the posterior footlobe is also incorporated. The proboscis protrudes over this wing-disc. The visceral mass with mantle is found underneath this wing plate. A large mantle gland is absent.
[1 genus]