Smaragdia souverbiana

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Smaragdia souverbiana is a tiny sea snail in the Neritidae family. Its opening is less than 2 mm wide. It lives in seagrass beds and probably feeds on seagrass cells rather than algae. The shell can be sandy to green, with thin black bands and small clear diamond-like marks on the whorls. It is found in the Indian Ocean near Madagascar and the Aldabra Atoll, and in the Mediterranean, as well as widely across the Indo-Pacific—from southern Australia (New South Wales) to Indonesia, Malaysia, the Philippines, and New Caledonia, with records along both eastern and western coasts of Australia. Feces from intertidal specimens show both seagrass material and epiphytes, supporting a seagrass-associated lifestyle.