Pinctada mazatlanica (Hanley, 1856)

• Mother-of-pearl
• Madreperla / ostra perlera

Scientific classification
Kingdom:Animalia
Phylum:Mollusca
Class:Bivalvia
Order:Pteriida
Family:Pteriidae
Genus:Pinctada
Species:P. mazatlanica

164mm

Isla de los Muertos (or Isla Santa Clara), Perú-Ecuador limit

From my collection

via Flickr https://flic.kr/p/2hsKLAR