Bivalves

Bivalves are a group of primarily marine, aquatic invertebrates made up by animals such as Clams, Mussels, Oysters and Cockles. They are classified by their two-sided shells which connect at a hinged joint, allowing them to open and close at will, and a large, singular muscle used for locomotion known as the 'foot' which is seen in other molluscs such as Gastropods. Some species of Bivalves also have the ability to propulsion themselves through water by swiftly forcing water out of their shell, this method of movement is more commonly seen in scallops. 

Bivalves are ordinarily filter feeders that fasten themselves to stones or the substrate of their environment to prevent themselves from being forced around by moving streams or the tide, but some species of Bivalves are active predators that use the aforementioned 'foot' muscle to snare and consume prey.  

Below you will find a comprehensive list of all the Bivalves I have found in the wild in and around the Whyalla region.