How many clams are there in the world?

It is difficult to provide an exact number of clams in the world as they are widely distributed across various ecosystems, including marine, freshwater, and terrestrial habitats. There are over 15,000 known species of clams, with varying population sizes depending on their habitat and environmental conditions. Scientists estimate that there are billions, if not trillions, of individual clams worldwide, playing important roles in marine ecosystems and food chains.