Which mollusc group includes primarily sedentary animals that use mucus-coated gills to trap fine food particles?

The mollusc group that includes primarily sedentary animals using mucus-coated gills to trap fine food particles is bivalves. This group includes clams, oysters, and mussels, which typically live in aquatic environments and filter-feed by siphoning water through their gills. The gills not only serve for respiration but also play a crucial role in feeding by capturing plankton and other small food particles from the water.