This limpet lives in clean running streams and rivers.
The length of the shell is up to 11 mm. The width of the shell is up to 8 mm. The height of the shell is up to 4.5 mm.
The length of the shell is 8.5 mm. The width of the shell is 6 mm. The height of the shell is 3 mm.
The shell is semiovate, thin and fragile, almost smooth, brown, semitransparent. Sculpture consisting of microscopic rather distant radiate striae, and fine dense concentric growth-lines. Colour pale to dark brown; interior dark brown in the centre, the lamina white. Apex posterior, extending a little beyond the margin, with a spiral nucleus of 1 whorl, visible on the right side. The apex is generally on the left side, but sometimes near the middle of the posterior margin.
The aperture is large, oval, the thin sharp margin generally rounded, but the posterior part of it is occasionally straightened and forming more or less distinct angles with the lateral sides, which themselves may become almost straight. The inside is polished. The lamella has the left attached end near the middle of the left margin, but the right free end does not extend beyond the posterior third of the length of the shell.
The animal has ringed filiform tentacles. The eyes are situated at the outer bases of the tentacles.
The formula of the radula is 30 x 27 + 1 + 27. The central tooth is small and bicuspid. The lateral teeth increasing in size up to the 16th, and then diminish again, they have first 1, then 2, and near the margin 3 cusps.
These animals are bioluminescent and highly phosphorescent. This can easily be seen in the dark by disturbing the animals, or by adding a few drops of alcohol to the water. This is the only known freshwater gastropod that emits light.
- Quantula striata, the only known terrestrial gastropod that emits light.
This article incorporates public domain text from the reference 
- IUCN 2008. 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 14 March 2009.
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