脊鳥蛤屬 脊鳥蛤屬學名Fragum是鳥蛤目鳥蛤科脊鳥蛤亞科之下的一個屬 本屬物種的特色為其特厚的雙殼Members of the genus have characteristic thick sculptured shells and live buried in sand extending their siphons to the surface to feed and breathe