amethyst gem clamの例文

• Examples of this are the introductions of the amethyst gem clam ( " Gemma gemma " ) and the European green crab ( " Carcinus maenas " ).
• The "'amethyst gem clam "', " Gemma gemma ", is species of very small saltwater clam, a marine bivalve mollusk in the family Veneridae, the Venus clams.