Pisidium stewarti is a species of minute freshwater clam. It is an aquatic bivalve mollusc in the family Sphaeriidae, the fingernail clams and pea clams.
This minute clam, which is known in Europe as a decidedly Pleistocene glacial species, has also been identified as a Recent species in the Central Asian high mountainous massifs of Tien Shan, the Pamir Mountains and the Himalaya.
The recent distribution includes:
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