Empty shell of a bivalve
The empty shell of the giant clam, Tridacna gigas. Note the pair of shells that are hinged together, a characteristic of members of the class Bivalvia.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"File:Tridacna gigas.001 - Aquarium Finisterrae.JPG."
http://en.wikipedia.org/wiki/File:Tridacna_gigas.001_-_Aquarium_Finisterrae.JPG
Wikipedia
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