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The diversity of infauna could correlated with it spesific niche, include grain size of sediment. We have investigated Gastropoda population in 9 sites of Alas Purwo National Park, East Java to analyzing Gastropoda as infauna and grain size. The diversity have analyzed by Shannon-Weinner Index, and the granulometric analysis for sediment. There are 13 species, 5 genus, 5 familia and 3 ordo of Gastropoda infauna in 6 research sites. The highest diversity index is 0.550 in Pancur beach. Based on sieve analysis of dry sediment, infauna prefer live in medium sand to very fine sand by graphic method: 1.680-3.783 Φ and fine sand to coarse silt by mathematic method: 2.190-4.231 Φ. Although in the same grain size, every niche of infauna has very spesific environment factors, include it assosiation with vegetation and sediment type.

Infauna, Gastropoda, diversity, grain size, niche