Marine invertebrates especially bivalve and gastropod are major organisms inhabit coastal areas. These marine organisms are also known as detritivores which filter sea bed component for food. The location of Peninsular Malaysia that surrounded by the sea such as Malacca Straits at the west coast and South China Sea at the east coast provide a good distribution for bivalve and gastropod. A study on distribution of bivalve and gastropod had been conducted at different coastal area which represent east and west coast. The studies areas are Pengkalan Balak, Melaka, Port Dickson, Negeri Sembilan, Tanjung Tuan, Negeri Sembilan, Telok Gong, Melaka and Penyabong, Johor. This study aims to identify bivalve and molluscs species at the study area. Beside to determine the diverse site of the species. West coast coastal line (Pengkalan Balak and Port Dickson) recorded the highest number of species compare than east coast coastal line (Mersing). Low species number of Bivalve and Molluscs are caused by the sandy coastline at the area which are not suitable for habitation. Furthermore, strong wave prevents the formation of muddy shoreline which unsuits for habitation. Thus, it is suggested that this study need to be extensively conducted in order to documents the species of bivalve and gastropod.