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Bivalves provide a range of ecosystem services such as turbidity reduction, denitrification induction, and habitat complexity provision. This study aimed to assess the composition and abundance of Bivalves in the intertidal areas of Karang Papak Coastal, West Java, Indonesia as well as analyze its diffeerent based on lunar phase. Three (50-m long) transects with five 1x1-m quadrant plots in each transect line of each research station were established seawards perpendicular to the coast line. The bivalves were composed of one famili (Mytilidae), two genera and two species of which Mya arenaria had the highest density and distribution every time of lunar phase which indicating their ability to adjust with the tide fluctuation every lunar phase conditios.