Vitrella Clessin, 1877 (invalid: junior homonym of Vitrella Swainson, 1840; Bythiospeum is a replacement name) Bythiospeum is a genus of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Moitessieriidae.

[2] Species within the genus Bythiospeum include:

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