plural noun
Mel·a·nel·li·dae | \ˌmeləˈneləˌdē\

Definition of Melanellidae 

: a family of small spiral usually white marine gastropod mollusks (order Pectinibranchia) including a number that are parasitic on various echinoderms

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History and Etymology for Melanellidae

New Latin, from Melanella, type genus + -idae

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