|Latia neritoides shells|
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.
If 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. Further details on its morphology and internal anatomy are given in Meyer-Rochow & Moore 
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. The light stems from a luminescent slime that is emitted by the snail when it gets disturbed or is attacked by a predator like,for instance, a crayfish, an eel or even a dragonfly nymph. Furter details on its ecology and general biology can be found in.  Latia luciferin is chemically (E)-2-methyl-4-(2,6,6-trimethyl-1-cyclohex-1-yl)-1-buten-1-ol formate.
- Quantula striata, the only known terrestrial gastropod that emits light.
This article incorporates public domain text from the reference 
- Moore, S. 2013. Latia neritoides. The IUCN Red List of Threatened Species 2013: e.T198906A2545381. https://dx.doi.org/10.2305/IUCN.UK.2013-2.RLTS.T198906A2545381.en. Downloaded on 26 November 2017.
- Suter H. 1913. Manual of the New Zealand Mollusca. Wellington. page 616.
- Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
- Meyer-Rochow, V.B.; Moore, S. (2009). Meyer-Rochow, VB (ed.). Hitherto unreported aspects of the ecology and anatoy of a unique gastropod - the bioluminescent freshwater pulmonate Latia neritoides: In: Bioluminescence in Focus - a collection of illuminating essays. Research Signpost, Trivandrum, Kerala. pp. 85–104.
- Meyer-Rochow V. B. & Moore S. (1988) "Biology of Latia neritoides Gray 1850 (Gastropoda, Pulmonata, Basommatophora): the Only Light-producing Freshwater Snail in the World". Internationale Revue der gesamten Hydrobiologie und Hydrographie 73(1): 21-42. doi:10.1002/iroh.19880730104.
- EC 126.96.36.199. ORENZA: a database of ORphan ENZyme Activities, accessed 27 November 2009.
- Shimomura, O.; Johnson, F. H.; Kohama, Y. (1972). "Reactions involved in bioluminescence systems of limpet (Latia neritoides) and luminous bacteria". Proceedings of the National Academy of Sciences of the United States of America. 69 (8): 2086–2089. doi:10.1073/pnas.69.8.2086. PMC 426874. PMID 4506078.
- Hubendick B. (1979) "Figures of Latia neritoides". Journal of Molluscan Studies 45: 353-354. abstract
- Ohmiya, Y.; Kojima, S.; Nakamura, M.; Niwa, H. (2005). "Bioluminescence in the Limpet-Like Snail, Latia neritoides". Bulletin of the Chemical Society of Japan. 78 (7): 1197. doi:10.1246/bcsj.78.1197.
- Shimomura, O.; Johnson, F. H. (1968). "The structure of Latia luciferin". Biochemistry. 7 (5): 1734–1738. doi:10.1021/bi00845a017. PMID 5650377.
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