Calyptraeidae
The Calyptraeidae are a family of small to medium-sized marine prosobranch gastropods.
This family includes the slipper snails, the Chinese hat snails,, and the cup-and-saucer snails among others.
The Calyptraeidae are the only family in the superfamily Calyptraeoidea. This family has no subfamilies according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005.
Crepidula fornicata was transported to Europe on imported American oysters in the late 19th century and is now considered a significant pest in European oyster beds.
Description
Internally, the shell is distinguished by a shelf-like, cup-like, or half-cup-like structure used for muscle attachment. Some calyptraeids have shells that externally resemble those of limpets, so species in the genus Crepidula are often called slipper limpets. However, these snails are not closely related to true limpets and are more closely related to conches and cowries. The "slipper" in the name "slipper limpet" is based on the appearance of the inside of the shell, which with its half-shelf resembles a traditional western bedroom slipper.Reproduction
Calyptraeids may form a tower of up to 25 animals, sometimes referred to as a mating chain. The bottom snail is always female. When she dies, the male above her will change from male to female, and the chain continues.Genera
Genera within the family Calyptraeidae include:Bicatillus Swainson, 1840Bostrycapulus Olsson & Harbison, 1953Calyptraea Lamarck, 1799Crepidula Lamarck, 1799Crepipatella Lesson, 1831Crucibulum Schumacher, 1817Desmaulus Rehder, 1943Ergaea H. Adams & A. Adams, 1854Grandicrepidula McLean, 1995Maoricrypta Finlay, 1926Sigapatella Lesson, 1930- † Taimyroconus Guzhov, 2015 Trochita Schumacher, 1817