Aplustridae

The Aplustridae is a taxonomic family of sea snails or bubble snails, marine gastropod mollusks in the superfamily Acteonoidea.

The former name of this family, Hydatinidae (Pilsbry, 1893) has been declared invalid.

Description
The soft parts of animals in this family are brightly colored.

The oval bubble-shaped shell is thin and fragile and has a sunken spire. The shell is white or beige-colored with colored bands or stripes.

There is no operculum.

Life habits
The soft parts of the animal cannot retract completely into the shell, and therefore these animals depend for their defense on swimming and camouflage. They are specialised feeders, eating cirratulinid polychaete worms.

Genera
Genera within the family Aplustridae include:
 * Aplustrum Schumacher, 1817
 * Bullina A. Férussac, 1822
 * Espinosina Ortea & Moro, 2017
 * Hydatina Schumacher, 1817
 * Micromelo Pilsbry, 1895
 * Parvaplustrum Powell, 1981
 * Rictaxiella Habe, 1958