Particles from calcareous sand sample: left snails, family Caecidae, upper juvenile. Right shells from juvenile Architectonicidae. Raja Ampat, Indonesia. Diagonal of frame approx. 3mm  Digital focus stacking image, CLOSE UPS,CUTOUT,DETAILS,INVERTEBRATES,MACRO,MARINE,MICROSCOPIC,MOLLUSCS,sand,SEASHELLS, Solvin Zankl