plural noun
Cal·​yp·​trae·​i·​dae | \ ˌkalə̇pˈtrēəˌdē\

Definition of Calyptraeidae 

: a family (order Pectinibranchia) of limpetlike marine gastropod mollusks having a curved internal lamina in the shell — see cup-and-saucer limpet

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History and Etymology for Calyptraeidae

New Latin, from Calyptraea, type genus (irregular from Greek kalyptra) + -idae

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