Cymbuliidae is a family of pelagic sea snails or "sea butterflies", marine gastropod mollusks in the superfamily Cymbulioidea.

[2] Instead of an external calcareous shell, they possess a pseudoconch, consisting of conchiolin, a cartilaginous tissue.

The mantle and the gill have disappeared as well.

Cymbuliidae are found in all marine waters between -54 and 55°N.

[3] The family Cymbuliidae consists of two following subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005): Genera within the family Cymbuliidae include: subfamily Cymbuliinae subfamily Glebinae