1) Genus pinctada 2) Mollusk genus 3) Pearl oysters 
Pinctada is a genus of saltwater clams, marine bivalve molluscs in the family Pteriidae, the pearl oysters. These oysters have a strong inner shell layer composed of nacre, also known as `mother of pearl`. Pearl oysters are not closely related to either the edible oysters of family Ostreidae, or the freshwater pearl mussels of the families Union.....
[n] - pearl oysters
genus Pinctada noun pearl oysters