Marstonia ogmorhaphe, common names the royal marstonia or royal springsnail, is a minute species of freshwater snail, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae, the mud snails.
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It is limited to the Sequatchie River Valley, where it lives in Blue Spring, the water supply for the town of Jasper, Tennessee, and the stream just past the spring.