1) Family anomiidae 2) Mollusk family 3) Saddle oysters 
Anomiidae is a family of saltwater clams, marine bivalve molluscs related to scallops and oysters, and known as anomiids. It contains seven genera. The family is known by several common names, including jingle shellsm mermaid`s toenails, and saddle oysters. Anomiids have extremely thin, translucent, paper-like shells. There is often a hole in the....
[n] - saddle oysters
family Anomiidae noun saddle oysters