The periostracum ( PERR-ee-OS-trə-kəm) is a thin, organic coating (or "skin") that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs, it is primarily seen in snails and clams, i.e.
The periostracum ( PERR-ee-OS-trə-kəm) is a thin, organic coating (or "skin") that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs, it is primarily seen in snails and clams, i.e.
Source: Wikipedia "Periostracum" · CC BY-SA 4.0
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