What is a pelecypoda?

A pelecypod, also known as a bivalve, is a type of mollusc that has a hinged, two-part shell. These animals are found in both freshwater and marine environments and vary in size from tiny species, such as the pea clam, to larger ones, such as the giant clam. Pelecypods are filter feeders, meaning they use their gills to strain plankton and other small organisms from the water.

A pelecypod's shell consists of two valves, which are connected by a hinge. The valves are made of calcium carbonate and are secreted by the animal's mantle. The mantle is a tissue layer that lines the inside of the shell and is responsible for secreting the shell material.

Pelecypods have a relatively simple body plan. They have a muscular foot, which they use to move around, and a pair of gills, which they use for breathing and feeding. They also have a pair of adductor muscles, which they use to close their shell.

Pelecypods play an important role in the marine ecosystem. They are a food source for a variety of animals, including fish, birds, and mammals. They also help to filter the water and remove harmful pollutants.

Some common examples of pelecypods include:

- Clams

- Oysters

- Scallops

- Mussels