• Atlantic thorny oyster
Scientific classification:
Kingdom:Animalia
Phylum:Mollusca
Class:Bivalvia
Order:Pectinida
Family:Spondylidae
Genus:Spondylus
Species:S. americanus
110 x 112 mm (excluding spines)
North of Cayenne, French Guiana
From my collection
via Flickr https://flic.kr/p/2ivmfNQ