DIVERSITY AND DISTRIBUTION PATTERNS OF GASTROPODA (MOLLUSCA) IN THE MANGROVE AREA OF TIRAM BEACH, PADANG PARIAMAN REGENCY, WEST SUMATRA PROVINCE By : Remi Fiter1), Syafruddin Nasution *2), Afrizal Tanjung 2) Faculty Fisheries and Marine Sciences, University of Riau Jl. Bina Widya KM 12.5 Simpang Baru, Tampan, Pekanbaru, Indonesia, 28293 Email: [email protected] ABSTRACT …