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Examples include the Belon oyster, eastern oyster, Olympia oyster, Pacific oyster, and the Sydney rock oyster.
Almost all shell-bearing mollusks can secrete pearls, yet most are not very valuable.
Once the female is fertilized, she discharges millions of eggs into the water.
The larvae develop in about six hours and exist suspended in the water column as veliger larvae for two to three weeks before settling on a bed and maturing to sexual adulthood within a year.
Their nervous system includes two pairs of nerve cords and three pairs of ganglia.
While some oysters have two sexes (European oyster and Olympia oyster), their reproductive organs contain both eggs and sperm.
These pearls are not as valuable as natural pearls, but look exactly the same.
A small, three-chambered heart, lying under the adductor muscle, pumps colorless blood to all parts of the body.
At the same time, two kidneys, located on the underside of the muscle, remove waste products from the blood.
Some kinds of pearl oysters are harvested for the pearl produced within the mantle.
Windowpane oysters are harvested for their translucent shells, which are used to make various kinds of decorative objects. This family includes the edible oysters, which mainly belong to the genera Ostrea, Crassostrea, Ostreola, Magallana, and Saccostrea.
Examples include: Because of its good flavor, it commands high prices.