family of molluscs
|Pacific oyster, Crassostrea gigas|
Like scallops, true oysters have a central adductor muscle. This causes a scar in the middle of the shell. It is the point of attachment. The shell is often irregular because oysters attach to substrates.
|Wikispecies has information on: Ostreidae.|
|Wikimedia Commons has media related to Ostreidae.|