Wikipedia
Peraclidae
Peraclidae is a family of pelagic sea snails or "sea butterflies", marine gastropod mollusks in the superfamily Cymbulioidea.
This family has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).
This family was originally called Procymbuliidae Tesch, 1913 and then called Peraclididae by Wenz in 1938. The name Peraclidae takes precedence.
Peracle is the type genus of the family Peraclidae.